LOONBALLOON Safari-Jungle Balloons, 17 inch KOALA 2 pcs, Accent your koala themed party with this 17in. round Koala foil mylar balloon. The perfect balloon for your koala party, this 17in. 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.