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 SteelBearing TypeCartridgeColorBlackCrown Race40S.H.I.S LowerEC49 Wolf Tooth Performance EC Lower Headset Headset Lower UPC: 810006803266