253035 Viewing surface snaps to the back of a 1-1/2'' extruded aluminum frame with a black powder coat finish. The frame is visible and serves as a black border around the perimeter of the image area. Features: -Add optional velvety black textile, Vel-Tex, to eliminate reflections on frame..-Surface is stretched taut, providing a flat viewing surface with a trim, finished appearance..-Depending on surface, available in sizes through 10' x 10' or 15' NTSC..-Custom sizes available..-Warranted for one year against defects in materials and workmanship.. Screen Material: M2500 Higher gain surface provides good black retention with accurate light colors and whites. M2500 is black-backed, and tolerates a higher ambient light level in the audience area than many front projection screen surfaces. On-axis gain of 1.5.