... Nitrided etc. 3.ISO9002,QS9000,TS16949 Piston Ringpiston ring for Isuzu 4JB1:1.piston ring material :nodular iron, cast iron ... V21C, V22C, F17C, F17E, V22D, F20C, V25C, V26C, F21C.Isuzu piston ringC220, C221, C240, C190, C223, 4JB1, 4JH1, 4BA1 ... DA220, GD150, DA640, 6BD1, 6BB1, 4BB1, 6BF1, 6BG1, 6BG1MTC, 4BE1, 6BG1-TC, 4BG1, 6HE1, 6HE1, 4HE1, 4HF1, 12PA1, 4HG1 ... any way we can! Piston ring for Isuzu 4JB1