The USBC Equipment and Specification team's process for testing and approving removable bowling ball devices ensures that no movable parts exist inside a bowling ball, including the weight block, thumb insert, and finger grips. This ensures the safety of bowlers, protects the bowling establishment from potential damage, and preserves the integrity of the game. Click here for a list of approved removable bowling ball devices. For further information, please consult the Equipment and Specifications Manual.

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New Millenium Pro Grips
Silicone Bridge Fusion
Tufflon Thumb Grip 
Donkee Products Sure Fit Changeable Thumb Insert
Exactacator Inc. Vise Interchangeable Thumb (IT)
Griploc Products Griploc
Jerome Products Flip Grips
Master Industries RevMaker
Multimed Thumbthing
Perfecta-Grip Industries Perfecta-Grip
Turbo 2-n-1  Switch Grip (Thumb & Fingers)
Ultimate Bowling Ultimate Thumb