Splash and frolic like a dolphin when you organise your ocean or sea themed party with this 79cm large unique shape Happy Dolphin foil mylar balloon. The ultimate balloon for your ocean or sea party, this 79cm Northstar party balloon is perfect for creating a wonderful experience! 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.