... 2.Different treatment:Phosphated, Nitrided etc. 3.ISO9002,QS9000,TS16949 Piston Ringpiston ring for Isuzu 4JB1:1.piston ring material :nodular ... etc(we can aslo do as per customer's request)3.piston ring characteristics:1)wear-resistant2)high temperature resistant3)reduce ... K13D, V21C, V22C, F17C, F17E, V22D, F20C, V25C, V26C, F21C.Isuzu piston ringC220, C221, C240, C190, C223, 4JB1, 4JH1, 4BA1, DA120 ...