The 52 x 92" Tensioned Cinema Contour HDTV Fixed Frame Projection Screen from Da-Lite is a wall mountable aluminum frame with an HD Progessive 1.1 Perf finish, 1.1 Gain rating and Greenguard certification for use indoors. This finish is designed for use with rear mounted speakers since its built-in perforations allow sound to penetrate with no acoustic loss. The fire retardant, mildew-resistant vinyl finish delivers true color and uniform edge-to-edge image diffusion. The frame is bordered with black Pro-Trim fabric; a smooth, felt-like material similar to the surface of a pool table that helps absorb any excess projection light that might intrude on the picture area. It also provides the screen with a professional finishing touch.