Costar tempered glass screen protector is the best guard of screen. The perfect manufacture procedure and highest quality control level make the product's excellent feature. With rounded edge and 0.33 slim body, it gives you perfect fitting on your mobile. And the 9H surface hardness makes the product scratches free, and AF nano-coating gives the products smooth touch feeling as while as anti-fingerprint feature. Further more, it is 99% transmissive which never impact on the display quality. Costar also provide you the installation guide, you can easily follow the step by step instruction to apply the screen guard by yourself!