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.
The box oval shape works great for a clean release. The material is easy to work but also takes a very smooth finish. Compared to plain oval inserts, very little material needs to be removed to fit the bowler. Compared to round inserts very little tape is ever needed; great product that everyone should try. The sizes are quite consistent from one lot to the next.