It uses a 0.5mm ultra thin optical glass with at least 90% transmittance. It has higher transparency than other LCD screen protector. It is as hard as 8H and it can prevent from being rubbed, scraped and bumped. It is well sealed by 3M double side adhesive tape which is not easy to be unglued and easy to be installed. There is no air bubble or angle occurs during sticking on the equipment. It will not affected by the temperature and humidity. It prevents the LCD screen infracted by sweat stain, smear, acid and alkali element and prolongs the life of the screen. Anti-Scratch, Anti-Dust, Anti-Collision, Moisture-proof, UV Protection.