Weighing in around 7lbs, save a little more than 3lbs per corner of rotating mass. Identical sized lightweight two-piece rotor and hat replace the heavy cast parts. CAD designed and FEA tested, our hats weigh just under 1lb and are designed with cooling reliefs for great thermal dissipation. Custom American gray iron rotors are mated for the ultimate in performance. Options for fixed or floating rotors – Floating rotor installation guide.