Features: Super hard, even-sharp objects such as knives-and keys will not scratch the tempered glass film. Prevents from fingerprints and other contaminants. Makes it easier to clean. If broken , the small pieces are held within the film. They are not-sharp, making it much safer to use than other glass product. Made with chemically treated, transparent tempered glass with silicone adhesive to keep it in place. When fitted the phones touch-screen sensitivity will remain unaffected. Does not effect the screen in any way after application, giving full-touch sensitivity and visibility. Specifications: Material:Tempered Glass Size:As Picture Shown For Garmin Edge 840/540 Thickness:0.3mm Package Includes: 1x Screen Protector note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.