... bottom price, developed some piston rings for KRAZ,IFA,KAMAZ,YAMZ,BELARUS,MAN,SCANIA,BENZ,FORD,FIAT,KIA,LANDROVER,PERKINS ... ....some information as follows for your reference:1, the rings from ... NitridingMoS2 CoatingPTFE CoatingCopper PlatingTin PlatingPhosphatingOxidingCeramics penetrating4,annual turnout : piston ring: 60,000,000pcs valve seat inset:10,000 ...