Easy at home assembly and set up. The self-sealing balloons will arrive uninflated. Simply insert a straw into the plastic valve at the bottom of the letter and slowly blow to inflate Fast and simple at-home inflation - inflate with enclosed straw and it's ready in 10 minutes Happy birthday letter foil balloon set- 13 aphabets Hang balloons on wall. To put up balloons, use tape or string to attach the balloons to the wall or hang from the ceiling Reusable- insert the air blowpipe straw into the valve and squeeze the out of the balloons lightly, fold them up and store them away from direct sunlight