engine parts piston ring 1.nodular iron, iron, alloy 2.polishing, plating, oxidation 3. ... good surface treatment 4. OEM SERVICE Engine parts piston ring 350mmRemark: 1.Good quality,good packing,good finish 2.Competitive ... Co., Ltd. Co., Ltd are as follow: Piston Piston Ring / Piston Ring Set / Ring Group / Ring PistonCylinder Liner / Cylinder SleevesMain Bearing / Engine Bearing SetCylinder ...