Accent your unicorn happy birthday themed party with this long-lasting 22″ Bubble – Birthday Rainbows Unicorn plastic Bubble Balloon. The perfect balloon for your unicorn happy birthday party, this 22″ Qualatex 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. Balloon arrives uninflated.