the 10mm frame is wrapped in high density black velour that has been selected for its ability to completely absorb any excess light the high density leds allow for a larger and smoother light aura than most of our competitors even at the corners it has a micro sawtooth surface structure necessary to deflect the image projected from below the screen optimally to the viewers eyes and not to the ceiling we have developed a tensioning system that guarantees a perfectly flat surface to increase your projector visual performance special designed for ultra short throw projector laser tv and absorbs up to 98 percent of ambient light.syi