Pre-made thumb inserts to fit your thumb faster! Know your size and get the same feel everytime!
Vinyl insert easy to install and unlike IT systems does not break! I fancy the IT stuff and every time, someone has one fail. I use the inserts in all my balls to achieve a similar feel. IT gives the same feel, but frankly, I see too many of them fail during competition. Even the pros who have ball reps to aide can't do much about it (if I was on their payroll I might feel differently!). Vinyl Inserts are reliable.