Betallic's 40" MEGALOONS foil mylar letter balloons are the ultimate way to celebrate someone's birthday, a businesses grand opening or for marketing a new product at a trade show! Spell out the person's name or product name and either inflate them with helium (to float) or with air (does not float) and attach them to the wall or hang like a streamer. These huge balloons are great for bouquets, photo backdrops, on the top of balloon columns or balloon arches and more.