Ruffwear Turnup Rubber Throw Toy- 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. Diameter: 2.5 in Height: 3 in Tennis ball-sized toy fits in standard-sized ball thrower Made from natural rubber, a renewable, sustainable resource Durable, chew-resistant Gum-massaging design Internal chamber holds kibble or small training treats Two-hole design prevents suction and whistles when thrown