Number 1 Giant Jumbo Helium Foil Mylar Balloons, 40 inch, Glossy Silver, Premium Quality, for 1st Birthday Party Easy to inflate using the a straw or an air handheld pump Easily hung on strings from ceilings or attached to wall with tape Reusable. Self-sealing valve for easy inflation and deflation. Shipped uninflated. Can be air filled or helium filled