DESC: This 50in x 92.5in Tensioned Dual Masking Electrol projection screen is excellent for video projection applications. With the ability to view from Letterbox to NTSC format, it's ideal for home theaters or where a variety of image formats are projected. It features a patented in-the-roller motor mounting system for quiet operation and a second motor that lowers and raises black masks into position to convert the screen to different formats. Its unique "step-back" masking design eliminates shadows and the tensioned screen provides an extra flat surface for optimum image quality when using video or data projection.