This cool Avengers balloon makes a great party decoration. The round balloon features cartoon versions of your favourite superheroes including Iron Man, The Hulk, Captain America, Thor and The Black Widow. Measures 45cm and can stay inflated for up to 7 days. The balloon is sold flat and requires helium. Size: 45cm Avengers Group Foil Balloon (Self Sealing Balloon, Requires Helium Inflation). Each