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 dog�s teeth. It�s 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 dog�s teeth Available in three sizes: Small, Medium, Large