45-50 Pcs Happy Birthday 3D Unicorn Decoration Balloons Diy Decor Party Set - 02Product Usage ? Foil balloons can be air or helium filled. Pump steps: Please do not over inflate the balloon which will damage the valve, 70% 80% air fill will be sufficient. Find the inflation valve, insert the nozzle of the pump into the balloon valve, and start pumping until 70% 80% full. No need to make a knot or use tape to seal the valve, it's automatically sealed after the pump is withdrawn. Release air steps: Prepare approximately a 15cm