# Fitting
Learn the step-by-step process of fitting a bowler's hand. Both conventional and fingertip grips for one-handed bowlers.
# Understanding a spec sheet
# Terminology
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/vphimage.png)
**Span:** The distance between the fingers and thumb used for the purpose of gripping the ball.
**Hole Size and Shape:** The internal measurements and shape of the hole or insert used.
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/WZBimage.png)
**Pitch:** The angle at which a hole is drilled in the ball. Pitch is defined as it relates to the center of the bowling ball. (A hole with “Zero” pitch would be any drilled hole where the center of the hole, if extended, would pass through the center of the ball.)
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/BPnimage.png)
The measurement of pitch is the distance that the center of the hole deviates from the center of the ball in a specific direction.
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/lnDimage.png)
The Pitches are based off the X and Y axis of each individual hole, Y being parallel to the centerline.
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/NtGimage.png)
***Forward Pitch**:* Term given to any hole where the center of the hole extended would pass above the center of the ball.
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/Dzcimage.png)
***Reverse Pitch:*** Term given to any hole where the center of the hole extended would pass below the center of the ball.
[ ](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/jAHimage.png)
**When viewing the back of your hand, forward pitch is towards the inside of your hand and reverse pitch is outside of your hand.**
***Side Pitch******:*** The right and left components of pitch in which the center of the drilled hole passes to the right or left of the center of the ball. Parallel lateral pitches are not the same as zero lateral pitch in both fingers!
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/7PGimage.png)
### **Why we do that? **
The proper fit will allow the customer to use less effort to grip the ball, allowing them to have a more relaxed arm swing and release. To accomplish this there is a relationship between span, pitch, hole size and shape.
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/1eXimage.png) - 50% Span (distance between the holes)
- 30% Pitch (angles of the holes)
- 20% Hole size and shape
# Conventional Fitting
# Anatomy of a Conventional Fit
### Key principles
1. Fingers are inserted into the second joint
2. Thumb is seeded all the way into the bowling ball, up to the base of the thumb
3. Good beginning grip
4. Lower revolution rate at point of release
5. Ball reaction is smaller and allows the bowler to focus on other aspects of their physical game
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/image.png)
# Step-by-step guide
### Following these steps will ensure a proper fit
1. Warm up the hand, massage/bowl
2. Measure the MIDDLE FINGER
3. Measure the THUMB FLEXIBILITY
4. Measure FINGER and THUMB hole sizes
---
### Constants to fill out on the spec sheet
- Before starting the measurement, you can already write down some data on your spec sheet.
1. Bowler Hand (Left or Right)
2. Bridge of 3/8
3. Lateral Pitches of 1/4 (middle) and 5/8 (ring)
4. Ring Finger measurement will always be +1/8 from the span measured on the next step.
---
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/AgEimage.png)
---
### Mark the bowler's hand with a pen
1. Mark the MIDDLE FINGER
- Find and mark the bending point of the SECOND joint.
- Measure 3/8 under the joint, draw a line.
- Use this line for your measurement.
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/zzTimage.png)
---
### Using the fitting tools
- BT Ball Fitter
- Innovative Fitting Ball **Prendre un photo avec le bal fitter pour montrer where to measure ??**
---
### Evaluate the flexibility of the thumb.
The bowler's hand must be relaxed.
- Pull back on the thumb to measure flexibility.
- Follow the chart provided for the correct pitch based on span/flexibility
** ***give a link to the chart ??*** **
[ ](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/d3Kimage.png)[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/wnJimage.png)
---
### Complete your Fitting Sheet
- **Finger Pitches**
1. Use the same pitches as what's in the thumb. **Ex: Span: 3 1/2, flexibility: 120° = 3/8 forward**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/Zayimage.png)
- **Hole Sizes**
\- Select a hole size that... Fingers easily passes through up to but not including second joint **même chose pour le pouce ?**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/hBHimage.png)
**Not sure ?** When in doubt, reduce the hole by 1-64 inch. You can always enlarge the holes.
# Finger Tip Fitting
# Nouvelle page
# Anatomy of a Finger Tip Fit
### Key principles
- Fingers are inserted to first joint
- Thumb is seeded all the way into the bowling ball, up to the base of the thumb
- More advanced grip
- Higher revolution rate at point of release
- Stronger ball reaction which allows the bowler to achieve larger entry angles
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/yLuimage.png)
# Step-by-step guide
### Following these steps will ensure a proper fit
1. Warm up your hand ( either massage or bowl)
2. Measure the MIDDLE FINGER
3. Measure THUMB FLEXIBILITY
4. Measure FINGER & THUMB hole sizes
---
### Constants to fill out on the spec sheet
- Before starting the measurement, you can already write down some data on your spec sheet.
1. 1. Bowler Hand (Left or Right)
2. Bridge between the fingers = 1/4
3. Lateral pitches: 3/8 (middle finger) and 1/2 (ring finger)
4. 5/16's rule
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/Y4limage.png)
---
### Mark the bowler's hand with a pen
1. Mark the MIDDLE FINGER
- Find and mark the bending point of the FIRST joint.
- Find and mark the bending point of the SECOND joint.
- Measure the distance between both lines.
- Divide that distance in half.
- Draw a line.
- Use this line with your fitting tools.
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/eojimage.png)
---
### 5/16's Rule:
This rule is used to find the measurement of the RING finger.
1. Find and mark the FIRST joint of the RING FINGER
2. Slightly cup the client’s hand, similar to the curvature of a bowling ball.
3. Draw a line from the FIRST joint of the MIDDLE FINGER onto the RING FINGER
4. Measure the distance between both lines on the RING FINGER.
5. Use the following equation: Measurement from #4 is hereby designated X. --- 5/16 – X = +/- distance of the RING FINGER
Ex #1 : If X (distance between both lines on the ring finger.)is 7/16 --- 5/16 – 7/16 = -1/8
The span of the RING FINGER is 1/8 shorter than the span of the MIDDLE FINGER.
Ex #2: If X is 1/8 --- 5/16 – 1/8 = 3/16
The span of the RING FINGER is 3/16 longer than the span of the MIDDLE FINGER.
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/YHeimage.png)
---
### Using the fitting tools
- BT Ball Fitter
- Innovative Fitting Ball **Prendre un photo avec le bal fitter pour montrer where to measure ??**
---
### Fingertip Pitches
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/yoIimage.png)
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/9f1image.png)
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/Wnjimage.png)
**Pitch what you see! 3/4 or more is very possible and sometimes required**
---
---
### Evaluate the thumb flexibility
The bowler's hand must be relaxed.
- Pull back on the thumb to measure the flexibility
- Follow the chart provided for the correct pitch based on span/flexibility
***give a link to the chart ??***
[ ](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/d3Kimage.png)[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/Wcdimage.png)
[ ](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/d3Kimage.png)
**You might modify pitch for the following reasons:**
**-A longer thumb (Over 2 5/8'')**
- - Add 1/16 - 1/8'' reverse
**- A shorter thumb (Under 2'')**
- - Subtract 1/16 - 1/8'' reverse
**- Very moist skin**
- - Add 1/16 - 1/8'' reverse
**- Extremely dry skin**
- - Subtract 1/16 - 1/8'' reverse
**- If the bowler uses excessive grip pressure**
- - Check hole sizes to determine if they are too large
---
### Recap of measurements
##### FINGERS:
- Check finger flex.
- For 80+% of your clients use REVERSE pitch only.
- ALWAYS REMEMBER TO COMPENSATE FOR GRIPS.
- Write down pitch on spec sheet to avoid confusion. [](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/74Qimage.png)
##### THUMB:
- Refer to thumb pitch chart.
- No lateral pitch for beginner/novice bowlers
#### **Choosing Ball Weight:**
Choosing the correct ball weight is crucial for first time and novice bowlers. Improper weight can make a comfortable grip uncomfortable.
- If the bowler is using a house ball comfortably for one game, and then gets tired... The same weight as the house ball, when fitted properly, should be fine
- If the bowler uses a house ball for three games with little to no problem, two pounds heavier than the house ball with a proper fit, should be fine
- For Junior bowlers; 10% of their body weight + 2 pounds as a maximum. You could also do same weight as their age to one pound less than their age will be fine
- Always let the customer test out the weight of the ball before drilling, to confirm the choice ( put undrilled ball in a see-saw) [](https://wiki.spectrebowling.com/uploads/images/gallery/2025-10/powerpnt-3gm7uslynl.png)
#### **Checking the Hand**
Your customers hand will not always be perfect, the importance of checking for the unusual cannot be overstated.
Possible modifications are necessary for:
- Arthritic joints
- Tendinitis
- Sensitive nerve or tendon
- Pain, soreness or swelling
- Callus, pathological callus
- Missing fingers [](https://wiki.spectrebowling.com/uploads/images/gallery/2025-10/powerpnt-2igq4tskng.png)
#### **Fitting Checklist:**
- Determine and record hole sizes and shape
- Determine flexibility of the hand
- Measure and record the span
- Determine and record vertical thumb pitch [](https://wiki.spectrebowling.com/uploads/images/gallery/2025-10/powerpnt-0sxi5itfrc.png)
**MEASURE THUMB AND FINGERS HOLE SIZE:**
-FINGERS
. Check using grips
. Grip should be slide in with slight restriction. Once inside hole, it will contract slightly.
. Indicate OD size
-THUMBS
. If round , aim small and work with tool.
.If oval, consult chart.
. Measure base of thumb for taper.
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-10/powerpnt-u4kagxym7b.png)
**"**
# Drilling an Oval Thumb
## 3 Measurements
- ##### Smallest - Starting bit
- ##### Largest - Width of oval
- ##### Oval direction
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-05/S81image.png)
## Taper base of thumb
- ##### Measure the base of the thumb
- ##### Start with that bit
- ##### Go down 1/8'' max
- ##### 1/32 step downs
- ##### Go till the starting bit
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-05/ZqZimage.png)
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-05/wpAimage.png)
###
# Inserts & Slugs
# Turbo
#### **Turbo Quad**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/tCzimage.png)
**Power Oval:**
- 0 Pitch in the grip
- No compensation needed
##### **Power Oval Mesh:**
- 1/8" FORWARD pitch in the grip
- Compensate 1/8" REVERSE when drilling the hole in the ball to arrive at the ending desired pitch\]
- Example: Normal Flex ( 1/4" REVERSE) = Drill the hole 3/8" REVERSE because 3/8" - 1/8" = 1/4"
#### **Turbo Quad 2**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/7rYimage.png)
##### **Oval Nubs:**
- 0 Pitch in the grip
- No compensation needed
##### **Semi:**
- 3/16" FORWARD pitch in the grip
- Compensate 3/16" REVERSE when drilling the hole in the ball to arrive at the ending desired pitch
- Example: Normal Flex ( 1/4" REVERSE) = Drill the hole 7/16" REVERSE because 7/16" - 3/16" = 1/4"
#### **Turbo Quad Classic**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/C8Fimage.png)
##### **Perfect Oval:**
- 0 Pitch in the grip
- No compensation needed
##### **Power Regular:**
- 1/4" FORWARD pitch in the grip
- Compensate 1/4" REVERSE when drilling the hole in the ball to arrive at the ending desired pitch
- Example: Normal Flex ( 1/4" REVERSE) = Drill the hole 1/2" REVERSE because 1/2" - 1/4" = 1/4"
#### **Turbo Quad Power SB**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/IPHimage.png)
##### **Power Regular:**
- 1/4" FORWARD pitch in the grip
- Compensate 1/4" REVERSE when drilling the hole in the ball to arrive at the ending desired pitch
- Example: Normal Flex ( 1/4" REVERSE ) = Drill the hole 1/2" REVERSE because 1/2" - 1/4" = 1/4"
##### **Semi:**
- 3/16" FORWARD pitch in the grip
- Compensate 3/16" REVERSE when drilling the hole in the ball to arrive at the ending desired pitch
- Example: Normal Flex ( 1/4" REVERSE ) = Drill the hole 7/16" REVERSE because 7/16" - 3/16" = 1/4"
#### **Turbo Ms Quad**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/blvimage.png)
##### **Power Oval:**
- 0 pitch in the grip
- No compensation needed
##### **Power Oval Mesh:**
- 1/8" FORWARD pitch in the grip
- Compensate 1/8" REVERSE when drilling the hole in the ball to arrive at the ending desired pitch
- Example: Normal Flex ( 1/4" REVERSE ) = Drill the hole 3/8" REVERSE because 3/8" - 1/8" = 1/4"
#### **Turbo Slug**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/nqzimage.png)
##### **Available Colors:**
- Black & White
- Orange & Yellow
- Blue & Purple
- Green & Red
- Pink & White
- Black ( Only for 1 1/2 )
##### **Available Sizes:**
- 1 1/8
- 1 1/4
- 1 3/8
- 1 1/2 ( Only in Black )
#### **Switch Grip Outer**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/Juoimage.png)
##### **Available Colors:**
- Black
- Orange
- Yellow
- Blue
- Green
- Red
#### **Switch Grip Inner Blank**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/Dizimage.png)
##### **Available Colors:**
- Black
- Orange
- Yellow
- Blue
- Green
- Red
#### **Switch Grip Black Inner 1 1/4**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/kDfimage.png)
##### **Available Colors:**
- Black & Black
- Black & Orange
- Black & Yellow
- Black & Blue
- Black & Green
- Black & Red
- Black & Purple
- Black & Pink
- Black & White
#### **Switch Grip Colored Inner 1 1/4**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/8flimage.png)
##### **Available Colors:**
- Black & Black
- Orange & Black
- Yellow & Black
- Blue & Black
- Green & Black
- Red & Black
#### **Switch Grip Inner 1 3/8**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/Oftimage.png)
##### **Available Color:**
- Black
# Vise
#### **Vise Powerlift/Semi**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/Uocimage.png)
##### **Powerlift:**
- 1/4" FORWARD pitch in the grip
- Compensate 1/4" REVERSE when drilling the hole in the ball to arrive at the ending desired pitch
- Example: Normal Flex ( 1/4" REVERSE ) = Drill the hole 1/2" REVERSE because 1/2" - 1/4" = 1/4"
##### **Semi:**
- 3/16" FORWARD pitch in the grip
- Compensate 3/16" REVERSE when drilling the hole in the ball to arrive at the ending desired pitch
- Example: Normal Flex ( 1/4" REVERSE ) = Drill the hole 7/16" REVERSE because 7/16" - 3/16" = 1/4"
#### **Vise Powerlift/Oval**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/WBhimage.png)
##### **Powerlift:**
- 1/4" FORWARD pitch in the grip
- Compensate 1/4" REVERSE when drilling the hole in the ball to arrive at the ending desired pitch
- Example: Normal Flex ( 1/4" REVERSE ) = Drill the hole 1/2" REVERSE because 1/2" - 1/4" = 1/4"
##### **Oval:**
- 0 pitch in the grip
- No compensation needed
#### **Vise Oval/Powerlift Oval**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/0c2image.png)
##### **Oval:**
- 0 pitch in the grip
- No compensation needed
##### **Powerlift Oval:**
- 1/4" FORWARD pitch in the grip
- Compensate 1/4" REVERSE when drilling the hole in the ball to arrive at the ending desired pitch
- Example: Normal Flex ( 1/4" REVERSE ) = Drill the hole 1/2" REVERSE because 1/2" - 1/4" = 1/4"
#### **Vise Oval Nubs**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/iABimage.png)
##### **Oval Nubs:**
- 0 pitch in the grip
- No compensation needed
#### **Vise Grip Semi**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/scVimage.png)
##### **Oval:**
- 0 pitch in the grip
- No compensate needed
#### **Vise Easy Slugs**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/Zohimage.png)
##### **Available Colors:**
- Black
- White
- Green
- Yellow
- Orange
- Purple
- Blue
- Red
- Pink
- Clear
- Neon
- Grape
##### **Available Sizes:**
- 1 1/8
- 1 1/4
- 1 3/8
#### **Vise Dual Easy Slugs**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/6Nmimage.png)
##### **Available Colors:**
- White & Black
- Green & Orange
- Yellow & Grape
- Neon Yellow & Red
- Pink & Blue
##### **Available Sizes:**
- 1 1/8
- 1 1/4
- 1 3/8
# Ultimate
#### **Ultimate Powerlift/Oval**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/eeeimage.png)
##### **Powerlift:**
- 1/4" FORWARD pitch in the grip
- Compensate 1/4" REVERSE when drilling the hole in the ball to arrive at the ending desired pitch
- Example: Normal Flex ( 1/4" REVERSE ) = Drill the hole 1/2" REVERSE because 1/2" - 1/4" = 1/4"
##### **Oval:**
- 0 pitch in the grip
- No compensation needed
#### **Ultimate Powerlift/Semi**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/6WIimage.png)
##### **Powerlift:**
- 1/4" FORWARD pitch in the grip
- Compensate 1/4" REVERSE when drilling the hole in the ball to arrive at the ending desired pitch
- Example: Normal Flex ( 1/4" REVERSE ) = Drill the hole 1/2" REVERSE because 1/2" - 1/4" = 1/4"
##### **Semi:**
- 3/16" FORWARD pitch in the grip
- Compensate 3/16" REVERSE when drilling the hole in the ball to arrive at the ending desired pitch
- Example: Normal Flex ( 1/4" REVERSE ) = Drill the hole 7/16" REVERSE because 7/16" - 3/16" = 1/4"
#### **Ultimate JR Powerlift/Semi**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/UXwimage.png)
##### **Powerlift:**
- 1/4" FORWARD pitch in the grip
- Compensate 1/4" REVERSE when drilling the hole in the ball to arrive at the ending desired pitch
- Example: Normal Flex ( 1/4" REVERSE ) = Drill the hole 1/2" REVERSE because 1/2" - 1/4" = 1/4"
##### **Semi:**
- 3/16" FORWARD pitch in the grip
- Compensate 3/16" REVERSE when drilling the hole in the ball to arrive at the ending desired pitch
- Example: Normal Flex (1/4" REVERSE ) = Drill the hole 7/16" REVERSE because 7/16" - 3/16" = 1/4"
#### **Ultimate JR Powerlift/Oval**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/knbimage.png)
##### **Powerlift:**
- 1/4" FORWARD pitch in the grip
- Compensate 1/4" REVERSE when drilling the hole in the ball to arrive at the ending desired pitch
- Example: Normal Flex ( 1/4" REVERSE ) = Drill the hole 1/2" REVERSE because 1/2" - 1/4" = 1/4"
##### **Oval:**
- 0 pitch in the grip
- No compensation needed
#### **Outer Interchangeable**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/bFWimage.png)
##### **Available Color:**
- Black
#### **Inner Interchangeable 1 1/4**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/8Uwimage.png)
##### **Available Color:**
- Black
#### **Loaded Inner Interchangeable**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/376image.png)
##### **Available Colors:**
- Black & Black
- Black & White
- Black & Green
- Black & Yellow
- Black & Orange
- Black & Purple
- Black & Blue
- Black & Red
- Black & Pink
- Black & Yellow Neon
##### **Available Sizes:**
- 1 1/4
- 1 3/8
# Contour
#### **Contour Oval**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/TCpimage.png)
##### **Oval:**
- 0 pitch in the grip
- No compensation needed
#### **Contour Semi Cerise**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/1XBimage.png)
##### **Semi:**
- 3/16" FORWARD pitch in the grip
- Compensate 3/16" REVERSE when drilling the hole in the ball to arrive at the ending desired pitch
- Example: Normal Flex ( 1/4" REVERSE ) = Drill the hole 7/16" REVERSE because 7/16" - 3/16" = 1/4"
#### **Contour Lady Semi Cerise**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/hJuimage.png)
##### **Semi:**
- 3/16" FORWARD pitch in the grip
- Compensate 3/16" REVERSE when drilling the hole in the ball to arrive at the ending desired pitch
- Example: Normal Flex ( 1/4" REVERSE ) = Drill the hole 7/16" REVERSE because 7/16" - 3/16" = 1/4"
#### **Contour Super Soft**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/Wxximage.png)
##### **Powerlift:**
- 1/4" FORWARD pitch in the grip
- Compensate 1/4" REVERSE when drilling the hole in the ball to arrive at the ending desired pitch
- Example: Normal Flex ( 1/4" REVERSE ) = Drill the hole 1/2" REVERSE because 1/2" - 1/4" = 1/4"
#### **Contour Oval Nubs**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/xS4image.png)
##### **Oval Nubs:**
- 0 pitch in the grip
- No compensation needed
# Jopo
#### **Jopo Power Flat/Oval**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/UtLimage.png)
##### **Power Flat:**
- 1/4" FORWARD pitch in the grip
- Compensate 1/4" REVERSE when drilling the hole in the ball to arrive at the ending desired pitch
- Example: Normal Flex ( 1/4" REVERSE) = Drill the hole 1/2" REVERSE because 1/2" - 1/4" = 1/4"
##### **Oval:**
- 0 pitch in the grip
- No compensation needed
#### **Jopo Power Oval/Oval**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/4IGimage.png)
##### **Power Oval:**
- 0 pitch in the grip
- No compensation needed
##### **Oval:**
- 0 pitch in the grip
- No compensation needed
#### **Jopo Twist Outer**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/H8Timage.png)
##### **Available Colors:**
- Black
- Blue
- Red
- Yellow
- Green
- Pink
- Purple
- Orange
- White
- Twisted
#### **Jopo 1 1/4 Twist Inner Empty**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/jI4image.png)
##### **Available Colors:**
- Black
- Blue
- Red
- Yellow
- Green
- Pink
- Purple
- Orange
- White
- Twisted
#### **Jopo Twist Inner 1 1/4**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/Tlximage.png)
##### **Available Colors:**
- Red & Red
- Purple & Purple
- White & Black
- Black & Black
- Yellow & Black
- Pink & Black
- Orange & Black
- Blue & Blue
- Green & Green
- Twisted & Black
#### **Jopo Twist Inner 1 3/8**
[](https://wiki.spectrebowling.com/uploads/images/gallery/2025-02/J7Mimage.png)
##### **Available Colors:**
- Black & Black
- Blue & Black
- Red & Black
- White & Black
- Black & Red
- Yellow & Black
- Black & Purple
- Black & Blue
- Green & Black
- Pink & Black
- Purple & Black
- Orange & Black
- Black & Green