Ronkoen for LG G Watch W100 - Retail Packaging Screen Protector Premium Glass 9H Hardness -0.2mm Ultra-high light transmittance. Automatic bonding: High quality antistatic adsorption film High sensitivity: The glass 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. Surface hardness up to 8-9 impact resistance is strong, not easy scratches. There is no bubble to install