The Turnup is an interactive toy that's almost round, so it bounces in all directions - ideal for athletic dogs of any size. It is compatible with ball throwers for hours of fetching fun. Our toys are designed to be interactive - it's just more fun that way. While our toys suit a range of play styles, dogs can be crafty and determined chewers, so supervised play is recommended. If any part of the toy becomes loose or detached, take the toy away and discard. Easy to Throw Tennis ball size fits in standard-sized ball thrower. Durable Rubber Made from natural latex rubber. Chew-Resistant Durable, chew-resistant. Erratic bounce for engaging fetch Internal chamber holds kibble or small treats Two-hole design prevents suction Materials