FSA Orbit 1.5E ZS Tapered Headset 1.1/8" 36°×45° ACB For tapered 50mm/62mm OD Head Tube 1.1/8" to 1.5" steerer Alloy top cover Upper: Forged alloy cup with ACB (blue seal) Lower: 1.5" CNC machined alloy cup with ACB (blue seal) Stack height: 16.9 + 2.9 = 19.8mm Weight: 129.6g