New Full Cover Tempered Glass, with adhesive over the entire surface and curved edges to "fit" perfectly on the screen.
It is stable and does not affect the contrast, brightness, colors, or sensitivity of the screen at all. Also, having curved "corners," it is compatible with almost all cases available on the market.
Its installation is very easy, unlike common 3D glass protectors, and it does not leave unsightly bubbles that can easily form on others.
This is the best protection for your mobile phone screen!