I have never been able to break one, even a first gen. one. I bowled with them since my local pro shop was introduced to them. I was a tournament and i needed one opened up and the pro shop drilled straight through the whole thumb and wreck the tabs on the bottom, i threw with it during the day, being cautious and still it never broke and never came out. I read up on the Turbo Switch Grips, guess to break the tabs on a 3rd gen. thumb you would have to throw it almost 40mph.