The California-Sunbounce Sun-Scrim No Moire Black Clip-On Density Doubler is a no moire screen designed to block the light transmission of 20x20’ Sun Scrim by 1/2 stop.The California Sunbounce Sun-Scrim No Moire Black Screen is a seamless black no moire screen that can be clipped on to a 20x20’ Sun ScrimThis no moire screen from California-Sunbounce can effectively cut the light transmission by 1/2 stop without creating a moire pattern in the shadow, when hooked on to a 20x20’ Sun Scrim