This revolutionary two-piece insert assembly allows bowlers to remove and interchange thumb inserts from one ball to another for the same fit and feel every shot. No more fussing and fighting installing and removing tape. With just a simple "Twist & Click", bowlers can make a ball change using the same thumb or better yet change thumb size due to shrinking or swelling. Bowl with confidence. Switch Grip will help you repeat shots no matter what ball you use. Switch Grip can also be used with Custom Thumb molds and remains the most reliable and versatile interchangeable insert on the market.