Optical glass strengthened through special crafting process. Prevent scratches, collisions and moderate impact to the LCD screen. The protector is reusable. Easy to Install: No trimming required, fit directly on your LCD screen. Just clean your LCD screen first, peel off the white back of the protector to stick, Done! Easy to install and bubbles free, unlike plastic protector which always gives you bubbles between the protector and the screen. No adhesive backing at the LCD screen, only at the border of the film for clearness. Can be removed and reinstall, without leaving ugly residual on your LCD screen.