Vise IT (Interchangeable Thumb), Turbo Switch Grip, and Griploc. I use Griploc, because they allow me to use oval or round thumb inserts. I understand, Turbo switch grips have them now. Interchangeable thumb inserts allow you to switch to different insert sizes, instead of using tape. Plus I can get the same feel/release when I switch balls. I use 4 bowling balls. If you blind folded me and hand me put my fingers/thumb in ANY of my bowling balls with the thumb insert, I can't tell which ball is which.
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