... 's need with 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 dia20mm to 295mm ... PlatingPhosphatingOxidingCeramics penetrating4,annual turnout : piston ring: 60,000,000pcs valve seat inset:10,000,000pcsspiral spring: 40,000,000pcs5,Quality policy ...