This Hello Kitty foil balloon has an automatic sealing valve. It can be filled with air so it can be fixed to the wall or can be filled with helium so that it floats. This balloon will come flat and not inflated with either air or helium, you must inflate this balloon yourself. This balloon measures 37 inches in length. This balloon is an ideal gift to a major fan of Hello Kitty, guaranteed to put a smile on their face! It could also be used as a fantastic decoration at your childs birthday party!