LOONBALLOON Birthday Bugs-Butterflies Balloons, 18 inch HAPPY FROG & FRIENDS, Accent your animal themed party with this 18in. round Happy Frog & Friends foil mylar balloon. The perfect balloon for your animal 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. Happy Frog & Friends Foil Mylar Balloon 18in.