Turbo Switch Grip Inner Sleeve with 1 3/8 Slug Black

 A Switch Grip Inner Sleeve combined with a 1 3/8" Urethane Solid black slug for those bowlers with larger thumbs and more bevel at the top of the thumb hole.

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. 

The empty inner sleeve would be combined with a thumb slug, urethane or vinyl, and then drilled and could then be used for each and every separate ball in your arsenal!  Never have to worry about thumb feel from ball to ball again!