The California-Sunbounce Sun-Scrim is a 12x12' No Moire Black clip-on density doubler.This 12x12' sun scrim is a very fine seamless black no moire screenThese California sunbounce reflectors can be clipped on to a sun scrim, but you should get clips separatelyWithout creating a moiré pattern in the shadow, the California-Sunbounce Sun-Scrim helps cut light transmission by 1/2 stop