This projection screen is ideal for classroom training, home theater movies, public display, conference room presentations, etc. The screen is 1.0 gain, so a optimal picture quality is guaranteed. Its white mat viewing surface diffuses the projected light uniformly. It\'s designed for both ceiling and wall mounting and it features a lightweight steel case for easy installation. It has a 4-sided black masking border which increases picture focus & contrast.In addition, its self-locking design allows the screen to be fixed at any position. The screen surface is easy to clean; simply wipe with water.Dust accumulation is highly prevented due to its smooth surface made from special light proof and mildew proof fabric, which is anti-static and anti-acid.