Wolf Tooth Performance Headsets are machined out of aircraft grade aluminum and assembled with Black Oxide Cartridge Bearings, balancing quality and price.Black Oxide Bearings are made from chromium steel for high load capacity and durabilityCustom molded dual-lip seal on the crown race to protect lower bearing in the toughest conditionsItem SpecificationsBearing TypeBlack Oxide SteelColorUltraviolet PurpleCrown Race40Lower Stack Height12.25S.H.I.S LowerEC44Weight45 Wolf Tooth Performance EC Lower Headset Headset Lower UPC: 810159401159