13pcs/lot: HAPPY BIRTHDAY 1.Colour: CHOOSE 2. Each foil balloon has a tail. You can inflate it from there. 3. The balloons have self sealing valves. Once inflated the balloon will stay up for over a week. 4. The balloons can be filled with helium to float or filled with air to attach to any surface, The balloon will come flat and need inflating after you receive it.The balloon sold without Helium. 5. When inflate the balloon, it should be slow and careful in case of the over inflating.