Jade love the ChuckIt! balls. They hold up really well! I have only had one "break" and all the happened was the stopper came loose and only attached on one side. I threw that one away so she wouldn't pull off and possibly choke on it. Other than that we lose them long before they break
What I love about them is that they are rubber, and not covered in the normal tennis ball fuze so they don't get soggy, just wet.