SPARKLING TRENDS apple watch 42mm (Series 3/2/1 Compatible) tempered glass screen protector 3d curved edge 9h hardness for apple watch 42mm – black the edges have been engineered to be compatible with the 3d pattern design of the apple watch. This tempered glass matches exactly as per the 3d curve of the apple watch display glass & seals the bond using japanese glue for superior touch sensitivity experience & is chemically treated to display the true hd experience of your apple watch. The biggest reason to choose SPARKLING TRENDS tempered glass is because it’s more durable. This tempered glass is 9h hardened and you won’t have to worry about your display meeting your keys or coins in your pocket. Tempered glass can also resist scratches from pointed sharp object and can even absorb shock when you occasionally drop your apple watch, thus protecting your display. With more severe falls, tempered glass will shatter in to small pieces but your display will remain intact. SPARKLING TRENDS tempered glass is made by controlled chemical and thermal treatments to increase its strength. The glass is first heated and then rapidly cooled with help of blowers. Surface gets cooled much faster thus putting it in compression and the other surface in tension. This difference makes the glass 5 to 10 times more stronger than it was in the first place to give you the true 9h shield for your apple watch display. True hd experience of your apple watch with 360 Degree (all round) protection for complete peace of mind this SPARKLING TRENDS 3d curved tempered glass give all round security to the apple watch display rather than the 2.5d tempered glasses. The curve is exactly as per the curve of apple watch so that this tempered glass rests perfectly on the display.