Coil-Over-Spring 500 Lbs./in. Rate 12 In. Length 2.5 In. I.D. Black EachAldan American 2. 5 inch Inner Diameter (I. D.) Coil Springs are made with Cold Wound High Tensile Chrome Silicon Steel. Our coil springs have a lifetime Warranty. With normal use and maintenance Aldan Coil Springs will hold 2% of their original rate and length over time. Aldan Springs are made from steel sourced and manufactured in the U. S. A. Attributes: Brand Name: Aldan American GTIN: 00710552281320 Color: Black Finish: Black Powdercoated