Avengers assemble! Bring your kid s favorite Marvel superheroes to the party with these Avengers Foil Balloons. Featuring Captain America Iron Man Hulk Thor Black Widow Ant Man and Hawkeye these balloons are a must-have for an Avengers birthday party. Balloons ship uninflated and measure 18 inches once inflated. You can fill the balloons with helium or air. To fill by air use a balloon pump or insert a plastic straw into the balloon valve and blow up by mouth. Once inflated you can combine the balloons together to make a fun balloon bouquet or you can tape the individual ones to walls or place them on tables. They also make a great addition to a photo booth. For more superhero fun combine these balloons with the rest of our Marvel Avengers themed party supplies.