You asked for it and AFCO delivered! Responding to market demand, now you can run high-quality AFCO springs and still get that murdered? look! AFCOIL Springs featuring all new black coating! Get the performance you are looking for with the tightest tolerances in the industry. All AFCOILS are manufactured using ultra high tensile wire. These springs are guaranteed not to lose more than 1% of free height. 2-5/8 I.D. design prevents spring lean and bow. Lifetime Warranty!