1-Hardness treatment,good finishing 2-Guarantee:100,000KM Timing ChainMaterial: Link Plate, 65Mn; Pin, SUJ2 or SCr440; Bush, 20CrMnMoProcess ... Pin, RC60; Link plate, RC47Pin Diameter Tolerance: 0.015mmTensile Strength: 5.5~6.0knGuarantee: 100,000KMTiming GearsMaterial: S45C, FCD450Treatment: CarbonizedTeeth Hardness: HRC48 ... , PA66Hardness: S45C, HRC18~22; PA66, HRC75~80Guarantee: One year Timing Kit