ABOUT HAPPY BrthDAY BALLOON Material is a high-quality aluminum foil. Quality product only using the best materials--safe and non-toxic. Easily hung on strings from ceilings or attached to the wall with tape. How to Properly Use Aluminum Foil Balloons Find the Self-sealing Valve ¡Use Air Pump or Straw to inflate them Blow air into the balloons must be slow the available pump charge to 90% then straw gass blowing easy to control so as not to break. If there are 2 layers of aluminum foil sticky situation must stop inflatingor easy to damage. ¢They can be reuseduse the straw to deflated balloons after party end If the balloon is filled with air good quality balloon is normally not leak it can last for several weeks or even monthes . Package Content 1 pcs ribbon 1 pcs straw 13 pcs alphabet balloons (HAPPY BrthDAY)