... including: a)conventional leaf spring,b)Z type leaf spring,c)parabolic leaf spring. 2.Thickness from 6 mm to 50 ... brand 8.Certificate: ISO9001; TS16949; COC; PVOC; CIQ; SONCAP; BV; C/O; FORM E. 9.Materials:SUP6, SUP7, SUP9, SUP9A, SUP10, SUP11 ...