The heat treatment for hardness to 56-59 HRCWith more torsion and ductilitySuitable for iPhone 5 / iPhone 4 & 4S / 3G &3GS, Samsung Galaxy SIII mini / i8190 , Note II / N7100 , Note / i9220 / N7000, Note LTE / N7005 , S II / i9100 , HTC One X , One V , One S and other Mobile Phone