... hydrogen. 2. It is a perfect decoration for parties. 3. Self-sealed after being filled Foil balloon, Mylar balloon; party balloon, Helium ... to your inquiry (size, design, color, packing and so on)3.Shape :round, heart-shape, star, cartoon, animal and etc.4 ... be filled with helium or hydrogen. It can be self-sealed after being filled.5.Usage:advertising,party,wedding,decoration, promotion ...