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The FSA Orbit 1.5E ZS 1 1/8 Inch Threadless Headset is for tapered 50mm/63mm OD head tube and comes with an alloy top cover, forged alloy and CNC machined alloy cups.1.1/8", 36°×45° ACBFor tapered 50mm/62mm OD Head Tube1.1/8" steererAlloy top coverUpper: Forged alloy cup with ACB (blue seal)Lower: 1.5" CNC machined alloy cup with ACB (blue seal)Stack height: 16.9 + 2.9 = 19.8mmWeight: 129.6gSpares:Upper Bearing: TH873 (160-1648)Lower Bearing: TH073 (160-6761)Crown Race: 1.1/8 (H6089, 160-5540)