40″ Holographic foil balloons.Foil and non-toxic: Made of aluminum foil material and non-toxic, no harm to your health. Enough thick to last long time and the foil balloons maybe have smell however this is normal smell of balloons.Suitable for any party:The Holographic mylar balloons perfect for a birthday party, engagement party, wedding celebration, bridal shower, Valentine’s Party or festival decoration and more party you think of!Float with helium: All foil mylar balloons must be filled with helium otherwise will not float. It also can blow up the air with a straw, but will not float. Then tie up a ribbon to hang them on the ceiling, there are loops on each side to hang the balloon though.Terrific decoration: This Holographic foil balloon Letter will be a hit at the Anniversary party or Birthday party. You can hang them on the ceiling or stick on the window, door, wall with dot clue. These 40″ Holographic balloons also can be a beautiful prop for photos, make a wonderful backdrop.