Detailed Product Description Our rear projection hard screen has a wide viewing angle about 178 degree, and its gain is about 4.0, it is one of anti-scratched rear screen in the market, its thickness is about 5.5mm, and its material is PMMA(polymethyl methacrylate), which is a strong and durable material, it is special processed according to fresnel optical theory, image eveness reach 93%, clear ...