LOONBALLOON Dinosaurs Balloons, 42 inch DIPLODOCUS balloon, Accent your dinosaur themed party with this 42in. large unique shape Diplodocus foil mylar balloon. The perfect balloon for your dinosaur party, this 42in. Balloons 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. 42in. Diplodocus Foil Mylar Balloon