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The FSA Orbit Z NO.9 1 1/8 Inch Threadless Headset is for 50mm OD head tubes and features an Alloy top cap, angular contact bearings and forged CrMo deeper cups.1.1/8 , 36°×36° ACB, Deeper cupsFor 50mm OD headtube1.1/8 steererAlloy top capForged CrMo deeper cupsAngular Contact Bearings (Black seal)Stack Height 15.8+2.1=17.9mmSpares:Top & Bottom bearings: TH872 (160-0016000000)Crown Race: H6119 (160-5558)