Progressively wound fork spring kits. Our Multirate fork springs are produced from the best spring materials available. They are precision wound and stress relieved and mechanically polished to increase surface density to improve corrosion resistance. Straight rate springs have the same rate every inch that they are compressed, which is fine on flat super smooth roads but they lack the ability of our Multirate fork springs to handle some of the more unpredictable road conditions without sacrificing ride quality. Comes with instructions for installation.