Material: made of high-quality aluminum film material, reusable and self-sealing. not easy to be pierced, can be applied anywhere anytime and by people of all ages, will catch people's attention and favor Large size: each sphere aluminum foil disco balloon measures approx. 22 inches in, the surface smooth and bright present like mirror reflect Easy to use: it is easy to inflate and deflate these 4d mylar balloons, the inflation port is flattened and the air outlet will be automatically sealed after being inflated, without extra operating, easy and simple Reusable：Can be used repeatedly, charging and discharging is convenient, do not use it once and throw it away Wide Application：This balloon is very suitable for a 70s theme party, disco party, dance party, birthday party, graduation, or anniversary.