These balloons have an automatic sealing valve. They can be filled with air so they can be fixed to the wall or can be filled with helium so they float. They will make a great decorations for your Children's party. Or buy as a surprise gift for any occasion! Please note that these balloons will come flat and not inflated, you must inflate these balloons yourself. You will receive 2 balloons. Blippi Shaped: 29 inches (74cm) & Round Characters: 18 inches (45cm).