12-INCH BLK LIGHT Reveal Disgusting Stains! Or find fluorescence in rocks. Light up your own disco. Play CSI, Your House. Make your teeth glow in the dark. All this and more is possible with the magic of black light. Designed to be mounted with double-sided tape, the light is 12-1/2" long, with a plastic casing (our pick of colors). Takes (8) "AA"s, not included.