... , Nitrided etc. 3.ISO9002,QS9000,TS16949 Piston Ringpiston ring for Isuzu 4JB1:1.piston ring material :nodular iron, cast iron, steel ... , F17E, V22D, F20C, V25C, V26C, F21C.Isuzu piston ringC220, C221, C240, C190, C223, 4JB1, 4JH1, 4BA1, DA120, DA220, GD150, DA640, 6BD1, 6BB1 ... help you in any way we can! Piston ring for Isuzu 4JB1