Ggenerator piston ring 1. nodular iron, iron, alloy 2. polishing, plating, oxidation 3. good surface treatment 4. OEM servic Generator Piston Ring Remark: 1.Good quality,good packing,good finish 2.Competitive price 3.Diameter:225MM 4.Professional service5.For European& American, Korean & Japanese etc. 6.Secure service piston ring