This lightweight Wide-5 flange is made from aircraft quality 7075-T6 Billet Aluminum. This flange features extra machine work to reduce weight, it is scalloped between the mounting holes and the O.D. of the spline area. It fits all standard wide-5 hubs. Weighs only 10.4 ounces. "WARNING: This product contains a chemical known to the State of California to cause cancer and birth defects or other reproductive harm."