●Since these balloons come completely with a self-seal valve, it is not necessary to heat seal the balloon after it is inflated. ●Custom printing are available for these balloons. Minimum order for custom print starting from 10,000 pieces and above. ▼Handling precautions ・These are air-fill only mini balloons. Helium gas filled will not make it float. ・The size of the balloons after inflating may change depending on the environment such as temperature and humidity. Please take note. ・Due to the shape of the balloon , please inflate the balloon slowly and carefully to prevent it from bursting .