1-Hardness:HB230-HB320 2-Guarantee:100,000KM Material: Cast Iron, Forged SteelSurface Treatment: PhosphatingCast Iron Hardness: HB230~HB320Cast Iron Nitriding Hardness: HV300~HV450Forged Steel Quenching Hardness: HRC40~55Guarantee: 100,000KM Crankshaft