This beautiful 1st Birthday Heart Foil Balloon in shades of pink is perfect for celebrating a 1st birthday . This foil balloon is printed on both sides with the highest quality in a unique and state-of -the-art process – directly in Germany. It can be filled with air and helium and has a self-sealing valve so that multiple refills are possible. Due to the particularly high-quality material, the levitation time with helium is at least 7 days , which can be extended by refilling. The balloon contracts when it is cold and expands when it is warm, which is why storage at around 20C is recommended.