RC 42mm Apple Watch Screen Protector, 0.2mm Tempered Glass Screen Protector for Apple Watch-Anti-Glare/Anti-Fingerprint/Anti-Bubble, Pack of 2 Designed slightly smaller than the actual screen of the device due to the curved edges of the iWatch 42MM. Extremely high hardness: resists scratches up to 9H, harder than a knife. Hydrophobic and oleophobic screen coating protects against sweat and oil residue from fingerprints. Optical transmittance grade, ultra-low reflection, high transparency, high sensitivity; bubble free. Simple to install and stay on the surface; Remove dust and aligning it properly prior to installation.