Accent your Mardi Gras or Fat Tuesday themed party with our 18 Inch round Mardi Gras foil Mylar balloon. The perfect decoration for your masquerade party this 18 Inch balloon is great for setting the scene! The balloon includes a self-sealing valve preventing the gas from escaping after it s inflated. Fill with helium to float or air fill and hang. Total average estimated volume: 0.50 Cubic Feet. Balloon arrives uninflated.