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. FEATURES: Stainless Steel Bearings provide unparalleled corrosion resistance Highly recommended if your headset will be exposed to wet conditions or sweat Lifetime warranty SPECS: Color: Black S.H.I.S. Stem Clamp Diameter: 28.6 Threadless Bearing Type: Cartridge , Stainless Steel S.H.I.S Upper: EC34 Upper Stack Height: 16mm