Loonballoon Collections,18in. Birthday Robot 2 Cogwheels, 2 Pearl White Latex, Accent your robot or gear themed party with this 18in. round Birthday Robot Cogwheels foil mylar balloon. The perfect balloon for your robot or gear party, this 18in. party balloon is great for setting the scene! This balloon includes a self-sealing valve, preventing the gas from escaping after it’s inflated. The balloon can be inflated with helium to float or with a balloon air inflator. Balloon arrives uninflated.