The raw material is used SUP7,SUP9,SUP9A, SUP10 ,SUP11,SUP11A and 50CrV4. we make a full range of conventional leaf spring and parabolic leaf spring and Z-type leaf spring and V-type leaf spring and train leaf spring, the products which is used in heavy duty trucks and trailers and light duty trucks etc different vehicles. The raw material is used SUP7,SUP9,SUP9A, SUP10 ,SUP11,SUP11A and 50CrV4. ...