"Ninety-Five Carbon, Cold Rolled Annealed Strip Steel, also known as AISI 1095 carbon spring steel, is the very finest of commercial quality (standard grade) High Carbon Spring Steel Strip available." ...
Rassini’s 1+C Hybrid leaf spring features a single steel parabolic main plate and a flat glass fiber composite helper plate to provide suspension on the rear wheels of the Ford F-150 pickup truck.