DESC: Model B with Matte White fabric. Durable Manual Wall or Ceiling Screen. Perfect for classroom, meeting rooms or home theaters. Easy pull-down system locks at intervals to fit a variety of projection formats. Nylon bearings provide smooth quiet operation for the life of the screen. Case design allows flush mounting to the ceiling or wall. Matte White is one of the most versatile screen surfaces and a good choice for situations when presentation material is being projected and ambient light is controllable. Its surface evenly distributes light over a wide viewing area. Colors remain bright and life-like, with no shifts in hue. Gain 1.0 with a 50-degree viewing half angle.