Our black light responsive, velvet posters are packed with a multitude of colors and psychedelic designs, that lets you experience an extreme visual treat! Some of the optical designs move when you stare at them! The Black Light poster measures 23"X35" and is shipped rolled in heavy cardboard tubing. So sit back, and prepare yourself for this kaleidoscopic trip. You can enhance the psychedelic effect of theblack light posters by using black light bulbs, available at any big hardware store. However, they are not needed. The black light posters look great even without the bulb. I HAVE MANY BLACK LIGHT POSTERS FOR SALE. CLICK "SEE OTHER ITEMS" UNDER MY SELLER NAME.