... Phosphated, Nitrided etc. 3.ISO9002,QS9000,TS16949 Piston Ringpiston ring for Isuzu 4JB1:1.piston ring material :nodular iron, cast iron, ... treatment:polishing, plating, oxidation, phosphating, etc(we can aslo do as per customer's request)3.piston ring characteristics:1 ... C240, C190, C223, 4JB1, 4JH1, 4BA1, DA120, DA220, GD150, DA640, 6BD1, 6BB1, 4BB1, 6BF1, 6BG1, 6BG1MTC, 4BE1, 6BG1-TC, 4BG1, 6HE1 ...