... . polishing, plating, oxidation 3. good surface treatment 4. OEM SERVICE Generator Piston Ring Remark: 1.Good quality,good packing,good finish ... Liner / Cylinder SleevesMain Bearing / Engine Bearing SetCylinder Gasket / Head Gasket / Full Gasket Set Cam Bush / Conrod BushValve / Valve seat / Valve guide ... / Piston liner kit / Liner setLiner seal / Seal kits / O-rings generator piston ring 350MM