GGS LCD Screen Protector glass for SONY NEX-5 NEX-3 The protector is reusable. Prevent scratches, collisions and moderate impact to the LCD screen. It is rigid and made of optical glass material, which achieves more than 90% of transmittance (high Only 0.5mm thick with 6 layers of coatings and UV Protection. Optical glass strengthened through special crafting process.