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The FSA Orbit Xtreme Pro threadless headset is constructed of forged and CNC machined 7075/T6 aluminum cups.Forged and CNC machined 7075/T6 aluminum cups1.5 patented alignment tip for increased durability and performanceadsets have 21mm headtube insertionStainless steel Angular Contact BearingsDeep Cup model has 22mm insertion of upper and lower cupsStainless steel crown raceEC34/28.6 (Industrial) | EC34/30 (Industrial)Item SpecificationsColorBlackWeight102Crown Race30Bearing TypeCartridgeDefined ColorBlackS.H.I.S UpperEC34S.H.I.S LowerEC34S.H.I.S. Stem Clamp Diameter28.6