... 57T etc.Front gear13T 14T 15T 16T 17T..etc415 420 428 428H 520etcMaterial45# steel, A3 steel 16Mn steeletc.Heat ... CRUX ....C100, WAVE, CB125T, A100, YB100, CD80, RC80, XL125.....420,428,520,428H, 525, 530 etcMaterial1045 steel, 1023 steel and 16MnSurface ... quenching and CarburizationPackaging:Blister card, Slide blister, Poly bag, sprockets and chain set box or according to your requirement.MOQ ...