... sevice our company is a leading piston ring manufacturer in China, founded in 1986, can make high-quality piston ring ... to meet market's need with bottom price, developed some piston rings for KRAZ,IFA,KAMAZ,YAMZ ... ,KIA,LANDROVER,PERKINS....some information as follows for your reference:1, the rings from dia20mm to 295mm are available2, material :Ductile cast ironpolybasic ...