NXUSA-300-60: Premium, feature packed, Dual Spring, Aluminum Alloy, Oil Dampening Cartridge, Light Weight, anodized, TOP DAMPER with (8) sets of tuning springs, multiple length eyelets, mounting screws and shims for the fitment of many platforms. Tested by our drivers for a few months with very impressive results. 7075, T-6 Swiss Aluminum Construction designed by: "JUD" Jesse Uresti Designs, optimized and built by: our experts at: Nexx Racing.