Chris King"s No Threadset Headset has been the industry standard for more years than many companies have existed. Sealed cartridge bearings, durable aluminum cups, and classic King style add up to a headset that will outlast your bike. Product FeaturesMaterial: (cups, bearing cap, stem cap) aluminum, (baseplate) stainless steelWeight: 84 gRecommended Use: smooth turnsManufacturer Warranty: 10 years