Pre-made thumb slugs to fit your non-round thumb! Those with "flatter" thumbs, this is the slug for you! Pre-made to fit your thumb without making hardly any changes! Comfortable and consistent release! The Pro V2 is the popular "Box Oval" shape made with a vinyl material preferred by Pro Shop Operators.
Which part of the thumb do I size, top to bottom or side to side7/10/2017 - By Buzz
You will want to measure the radius of your thumb.7/12/2017 - By Bowling.Com Staff
Use a measuring tool that can measure down to the 64th inch and measure the widest part of your thumb. I would recommend getting it professionally done at a pro shop to get the correct size.12/26/2017 - By Experienced User