GGS III Generation Optical Glass Screen Protector For Canon EOS 550D It uses the ultrathin optical glass with at least 90% transmittance. The image is displayed in focus when applied With the explosion-proof film, it will not damage the LCD screen at all, and its elasticity pressure has reached 12kg/cm2, preventing the LCD screen from being impacted. With special treatment, its hardness and durability is close to or as high as mobs scale 8H, preventing the LCD Screen from being rubbed and scraped.