Accent your dinosaur themed party with this 21 inch large unique shape Cute & Colorful Stegosaurus foil mylar balloon. The perfect balloon for your dinosaur party, this 21 inch 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.