Wolf Tooth Premium headsets are machined out of aircraft grade aluminum and feature high-end bearings made by Enduro. They are engineered to use the largest possible ball size and are filled with high-pressure waterproof lubricant. A pair of dual-lip seals ride in micro-grooves to keep out water and debris.Stainless Steel Bearings provide unparalleled corrosion resistanceHighly recommended if your headset will be exposed to wet conditions or sweatCustom molded dual-lip seal on the crown race to protect lower bearing in the toughest conditionsLifetime warranty