The Smart Choice (TM) LG Tribute Ls660 , LG Optimus F60 Screen Protector , Highest Quality Premium Anti-scratch Bubble-free Reduce Fingerprint No Rainbow Washable Screen Protector Easy Install Product (Tempered Glass Screen Protector) The Tempered Glass is 0.4mm thick and made with chemically treated transparent tempered glass. Can provide break protection and shock resistance. The surface of The Tempered Glass has a hardness of 8-9H, three times stronger than regular PET film. Even sharp objects such as knives and keys will not scratch this product. The Tempered Glass has an oleophobic coating that prevents fingerprints and other contaminants and makes the film easy to clean. The Tempered Glass is coated on the back with a strong silicon adhesive that makes installation easy and the film attached firmly so as to not affect the touch screen's sensitivity. If broken, the Tempered Glass breaks into small pieces, which are not sharp, making it safer than other glass products.