21.5 inch Wide Privacy Filter Screen Protector Film Widescreen Monitor 16:10 ratio (Home n Office): 21.5 inches Widescreen, Filter size(WxH) = 18.75x10.56 inch(=477x268mm), 16:9 aspect ratio, "Check your screen size before purchasing!" Effective "black out" privacy from side views outside the 60-degree viewing angle. This function works for left and right sides, not for back side. Reversible glossy or matte surface finish, matte side reduces extra glare and reflections Over 3H surface hardness anti-scratch technology protects screen from dirt, debris and scratches. / Simple bulk package for supplying in the most reasonable price. Seller "Home n Office" is official seller of this authentic privacy filter, / other seller is selling the fake item made in China that is not guaranteed, not authentic product, not same as this privacy filter, please be careful.