Designed Specifically for the Dirt Modified Racer Using Our Proprietary Ultra-High Tensile Alloy. More Travel - Increased Travel Reduces Shear Loads and Stores More Energy Which Equals Increased Grip In and Off the Corner. Ultra-Lightweight for Increased Vehicle Response and More Usable Power to the Ground. Each Platinum Spring is Wound to Exact Tolerances and Dyno Tested with Graph Results Included. Made By Eibach in the U.S.A.