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: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.