253073 Size: 53" x 53" A permanently tensioned screen that provides perfect picture quality. The screen surface is stretched taut, providing a flat viewing surface with a trim, finished appearance. The 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. HiDef Grey: Grey front projection surface. HiDef Grey is designed with a low gain of 0.8 to meet the demands of today"s high-output video projectors. The grey color enhances color contrast and black levels in the projected image and also allows for more ambient light in the audience area than traditional surfaces.