The Case Friendly 9H hardened Glass Screen Protector from PureGear provides 99.9% transparent HD viewing for crystal clear glass. PureGear screen protector utilizes tempered glass made to be a little smaller than the actual screen of the device. This is to prevent the protector from overlaying these curved edges which can lead to unwanted bubbling and peeling up around the edges. Key Features Laser-cut dimensions provide maximum protection for the screen of your device, perfect cut and fit for your screen High definition with 99.9% transparency (HD), hassle-free, dust-free, fingerprint-free,bubble free, one-push installation Ultra thin thickness is reliable and resilient, and delivers full compatibility with touchscreen sensitivity Premium Quality, Highly durable, and scratch resistant – surface hardness 9H Case-Friendly Fit COMPATIBILITY: Apple: Watch 38-40 mm (Series 1,2,3,4,5)