This Glow In the Dark Handprints Wall Art decoration includes a variety of decals that will add a biohazard feel to your Halloween display. Not just for walls, this assortment of green glowing handprints and various green glowing splatters adhere to most smooth, non-porous surfaces without the use of adhesives. Green images are printed on a transparent background and the glow effect needs exposure to light. Not recommended for wallpaper. Glow In Dark Hands Wall Art includes 20 images that measure 2"W - 9"W printed on 2 sheets.