If you are a serious bowler then you know the irritation a few games can cause the skin on your fingers. Robby's offers the Thumb Saver to protect against blisters, calluses, and swelling while creating a smooth release.
Right Hand Only
Rubber tip is very large and doesn't fit good in my thumb hole, I had to get it drilled a little bigger so it would fit and not hurt my thumb. Otherwise a good product.