LOONBALLOON Football Balloons, 18 inch GO Team Football (2 pcs), Accent your football themed party with this 18" round Go Team Football foil mylar balloon. The perfect balloon for your football party, this 18" 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.