These lovely balls are designed for sports (fetch) lovers! Each set contains one tennis ball, one pool ball, and one baseball, they will surely make the fetch game more fun and without cotton so they can last longer with our little aggressive ball players. Even if your pup rip the cover off after some time, there's a strong squeaky ball inside each ball that he can still play with. Keep throwing and let the fun begin. Note these balls may be too small for large breed dogs.