screen protector with marketing propose. In the market only very few high quality screen protector can reach 95% light transmittance. And the poor screen protectors' are under 80%,which result to bad screen display, low the screen lighten, and eye-tired.

4H rigidity. There is some chance that you can find some screen protectors with 4H or 5H or higher description. Truly it is not the real rigidity. And now you have to know the rainbow grain. And when the base film is in the harden treatment process, it need high temperature. During this process, the asymmetry molecule in the surface of the base film scatters. And the higher harden treatment, the harder to control the rainbow grain. Therefore the rainbow grain influences the version effect. So the higher rigidity, the much the rainbow grain. to get the idea vision effect, the rigidity usually be kept between 3.5H and 3.8H. If beyond such value range, then it is fault rigidity or there too much rainbow grain. (www.fletion.com)