Want to make your backdrop and your party stand out? These A thru Z Aluminum Foil Gold Party Balloon are perfect for your event. Spell out the event of your party in golden fashion. The 16" balloons are air-filled only. They will not float with helium as they are too small. You may be require to apply some type of adhesive like tape to prop them. The 40" balloons can be filled with helium and will float by themselves without any help.