12ft Colors Happy Birthday Prism Banner. Make your celebration more special with our Prismatic Foil “Happy Birthday” Banner. 1 Birthday Banner – 12 ft. This colorful prismatic banner features a “Happy Birthday” headline with fun and colorful design. This disposable prismatic banner is perfect for celebrating fun birthday parties. Made of durable foil material, this prismatic banner is very eye catching with high quality prints. This product is easy to assemble, install, and can be stored and re-used.