Giant gorgeous 40 inch silver letter balloon add more fun to your event!!!How to Properly Use Aluminum Foil Balloons:1: Find the Self-sealing Valve.2: Use Air Pump or Straw to inflate them.Blow air into the balloons must be slow, the available pump charge to 90%, then straw gas blowing, easy to control, so as not to break. If there are 2 layers of aluminum foil sticky situation, must stop inflating, separate the 2 layer of aluminum foil and then inflated, or easy to damage.3: Can be reused, prepare a thin tube. Insert the tube from the charging opening until you feel the gas flow out, gently press the balloon with your hand until the gas is released, finally,fold and collapse it.4: The balloons can float if you pump with helium. Please note that it cannot float with other gas.If the balloon is filled with air, good quality of the balloon is normally not leak, it can last for several weeks or even more than 1 month.!NOTE:Do not expose foil balloons to extreme heat or they can burst.Due to the special nature of the balloon, we can not open the balloon check. The damage rate is 0.5%.Please temporarily find a tape to stick to the broken hole when urgent.Choking hazard - children under 8 yrs may choke or suffocate on un inflated or broken balloons.Adult needs supervision and keep un inflated balloons away from children.