Premium Real Tempered Glass Screen Film Protector For Apple iWatch 42mm Watch The item is made to protect the LCD from damage and scratches with specially processed glass that has been reinforced to increase shock absorbency. The entire surface of the protector is transparent and the back side is covered with a strong silicon adhesive for easy installation. When installed, there are no gaps between the LCD and the protector which means the touch screen's sensitivity is unaffected. Whole Transparency: The protector is 0.3mm~0.4mm thick and made with chemically treated, transparent tempered glass. Surface hardness : 8~9H: The surface of the protector has a hardness of 8-9H, three times stronger than regular PET film. Even shard objects such as knives and keys will not scratch the protector. Oleophobic Coating: The protector has an oleophobic coating that prevents fingerprints and other contaminants and makes the film easy to clean. Delicate Touch: The protector is coated on the back with a strong silicon adhesive that makes installation easy and attaches the film firmly so as to not affect the touch screen's sensitivity. Anti-Shatter Film: If broken, the protector breaks into small pieces that are not sharp, making it safer than other glass products.