Launch the Chuckit! Ultra Tumbler with either a Medium or a Large size Chuckit!® Ball Launcher. This Unique toy has the same buoyancy and durability as the famous Ultra Ball, but the versatility and erratic motion make playtime even more fun. Compatible with both medium and large Chuckit!® launchersDesigned to have the same high durability as the Ultra BallErratic bounce and wobble for Ultra fun play.