Celebrate that special someone's birthday with this fun 45cm Birthday Cake with Stars Foil Balloon. The perfect balloon for your birthday party, this Cti mylar foil balloon is perfect for getting the party started in a big way. 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.