Prism 4.5 inches on illustrated card Experience the amazing full color spectrum! What a novel(ty) idea! Makes a great, wacky gift! Educational as well as fun, our 4 1/2-inches wide plastic prism comes on an illustrated blistercard with interesting facts about color, light and refraction. Order yours today! Measures about 5/8-inch tall x 4 1/2-inches wide x 1 1/4-inches long.