LOONBALLOON Birthday Balloons, 18in. It’s A BOY Snail, 4c blue latex set, Accent your baby boy themed party with this 18in. round It’s A Boy Snail foil mylar balloon. The perfect balloon for your baby boy party, this 18in. 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. It’s A Boy Snail Foil Mylar Balloon 18in.