There is only one answer, and that is the floating helium balloon. You can consult the wedding dress shop. Everyone knows that. Helium has replaced hydrogen at present, because hydrogen is flammable and explosive, and it will explode when it meets open fire with air, which is more dangerous. Helium is a colorless, odorless, non-toxic and nonflammable inert gas, and lighter than air, which is more suitable for upgrading hydrogen. Now people have widely used helium balloons in public places, wedding occasions, wedding room layout and birthday parties. I hope my answer can help you.