40 inch 2 .0. 2. 5 shape foil balloons.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.- If the balloon is filled with air, good quality of the balloon is normally not leak, it can last for several months or even half an year.Special note:The aluminum foil balloons inflation must be slow, so as not to break. Sharp objects are prone to damage to the ball skin burst.The balloons are reusable, just insert a straw into the valve and squeeze the air or helium out of the balloons, fold them up and store them away from direct sunlight.Please temporarily find a tape to stick to the broken hole when urgent.