GGS Optical Glass LCD Screen Protector 2.7 inches for Digital Cameras It is rigid and made of optical glass material, which achieves more than 90% of transmittance (high Only 0.5mm thick with 4 layers of coatings and UV Protection. Optical glass strengthened through special crafting process. Prevent scratches, collisions and moderate impact to the LCD screen. The protector is reusable.