12ft Foil Age 18 Birthday Banner. Transform your place into a colorful and eyecatching venue with our disposable “Happy 18th Birthday” Fun Art Foil Banner. 1 Birthday Banner – 12 ft. This colorful banner features a “Happy 18th Birthday” headline with fun art design. This disposable birthday banner is perfect for celebrating fun birthday parties. Made of durable foil material, this colorful banner is very eye catching with high quality prints. This product is easy to assemble, install, and can be stored and re-used.