The Manual Series pull down wall or ceiling mounted projection screen is perfect for Classrooms, Conference Rooms and inexpensive DIY Home Theater applications. The Alltec Manual projector screen is a great alternative to an electric projection screen, at a fraction of the cost. Simple and reliable, this screen offers a rugged and efficient projection solution for rigorous daily use, at a very affordable price. Matte White - The most versatile screen fabric surface and the premier choice when ambient light is controllable. The Matte White projector screen fabric evenly distributes light over a wide viewing area, while colors remain bright and life-like, with no shifts in hue or contrast. The 120° viewing angle allows for a very wide audience seating arrangement. With an even Gain of 1.0, this projector screen fabric allows for no loss of brightness from the projection source, as long as ambient light is controlled. A black backing to the fabric is also added to impede any light penetration from behind the projected surface.The matte white screen surface can be easily and safely cleaned with mild soap and water. Do not use any other stronger chemical cleaners, as this may negatively affect the projection surface. The fabric surface is also flame retardant and mildew resistant.