This pocket-sized rainbow lens is made with a special diffraction film that transforms light into a prism of rainbow hues! • 1.75" lens made of paperboard diffraction film • packaged with a metallic rainbow instruction card • sealed in a protective cellophane sleeve HOW TO USE: Look at any light source through the rainbow lens and watch it transform into kaleidoscopic rainbow starbursts. Try viewing different types of light and watch different patterns emerge. Or, use the rainbow lens as a filter over your camera phone lens and fill your photos with an explosion of rainbows!