Teliqi Tempered Glass Screen Protector Film Guard for Sealed Pebble Steel Matte Black Smart Watch Model 401BLR, Surface is anti-oil processing (Oleophobic coating), so fingerprints and oil is not easy to stay surface, easy to clean. Surface hardness: The surface has a hardness of 8-9h,It is 9 times stronger than ordinary glasses. Tool and keys are not cuts Delicate touch: the back of strong adhesives, easy to install, and therefore does not affect the touch sensitivity of the touch screen Explosion-proof, shatter-resistant glass breaks into small piece of for sharp, more secure than other glass products. Ultra-thin glass can be treated by toughening under high temperature of 420.