1.Anti-scratch(DOL)40μm, anti-pressure(CS) 700 MPa2.4000times or 8000times rubbed by machine back and forth3.Chamfer angle 90 degree of water drop4.Steel Ball Test:-Ball weight 32g-DIA=60CM5. anti-scratch / anti-shock / waterproof / anti-static / dust-proof / anti-fingerprint / oleophobic / anti-broken.6.No bubbles, Easy installation