Accent your space or astronaut themed party with this 29" large unique shape Blast Off Birthday foil mylar balloon. The perfect balloon for your space or astronaut party, this 29" Anagram 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.