Silver foil balloon kit - Happy Birthday

13 silver foil letter balloons that spell out HAPPY BIRTHDAY, perfect for making into a garland at a birthday party!Do not over-inflate the balloons as there is a risk that they will burst!Each letter measures 40cm in height.The balloons arrive flat (uninflated) and without string to hang them up.These balloons can be inflated using normal air with a pump or a staw, and have an automatic closing mechanism. Insert the straw into the opening, deep enough to facilitate inflation.Helium inflation is not recommended with these balloons.