Decorate either a 4th birthday celebration with our Number 4 Multi-Color Junior Shape Foil Balloon or add with another number to create the age your celebrating! This balloon is shaped like a number "4" and features multi-color number fours on the back. This balloon ships flat and can be inflated with air or helium. Self-sealing and reusable. Measures 18". Includes 1 foil balloon per package.