The KONG AirDog Dumbbell combines two classic dog toys the tennis ball and the squeaker toy to create the perfect fetch toy. Our durable, high-quality AirDog Dumbbell will not wear down a dogs teeth. Its made with a special nonabrasive felt, compared to the abrasive material on normal tennis balls. Perfect for games of fetch Squeaker to induce play Nonabrasive tennis material will not wear down your dogs teeth Available in three sizes: Small, Medium, Large