MOTORCYCLE CHAIN:25H.420.420H.428.428H.520.520H.525.525H.530.630... O-ring motorcycle chain:420OR ,428HVS.520OR.520HOR.530HOR.. Model : Motorcycle chain :25H.420.420H.428.428H.520.520H.525.525H.530.630... O-ring motorcycle chain:420OR ,428HVS.520OR.520HOR.530HOR...Colors available: natural, yellow, blue, black, gold. whiteMaterial: carbon steelFinishes: nickel plated, zinc plated, copper plated