Motorcycle chain sprocket set Titan Material, A3 steel, 45# steel,Iron Model:415,420,428,428H,520 Heat ... 34T 35T 36T 37T 41T ……58TMaterial 1045(45#) steel, 1023(Q235)A3 steel , 16Mn steel…etc. Heat treatment High frequency quenching ,Carburization….etcSurface ... (front:13T--17T; rear :34T---57T )Material:____________ (Q235 steel, 1045 steel,or others )Thickness: ___________mm (6.0mm ,6.5mm, ...