Super high bounce Ultra Ball. Better than standard tennis balls, the Ultra Ball is made of durable rubber yielding an ultra bouncy, exciting fetch experience on land or on water thanks to lightweight, buoyant design. Compatible with size Medium Chuckit Launchers. This rugged dog fetch toy has a textured surface and a thick rubber core that can stand up to rough play yet is soft on dog's mouths. Not intended as a pure chew toy, always supervise your dog when playing with this toy. Measures 2 inches in diameter and is best suited for dogs weighing 0 to 20 pounds. Should be small enough for your dog to carry, but large enough that the ball can't completely fit in their mouth. When in doubt, buy a size up.