Celebrate that special someone's birthday with this exciting 76cm Mighty Bright Hot Air Balloon Birthday Foil Balloon. Combine a couple of these Betallic mylar foil balloons to create an awesome balloon bouquet for a birthday party!. 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.