GGS Self-adhesive Special Frame Design Optical Glass LCD Screen Protector for Canon EOS 100D / Rebel SL1 / Kiss X7 It is rigid and made of optical glass material, which achieves almost 90% of transmittance (higher than plastic LCD screen protectors), thus making the LCD screen clear. Only 0.5mm thick with 6 layers of coatings and UV Protection. Optical glass strengthened through special crafting process. Prevent scratches, collisions and moderate impact to the LCD screen. Max impact force: 12 kg/cm