The FSA Orbit 1.5E ZS Tapered Steerer Headset is designed for tapered head tubes measuring 50mm/62mm OD. It features a 1.1/8" to 1.5" steerer compatibility, an alloy top cover, and forged alloy cups with ACB (blue seal) for the upper section. The lower section includes a 1.5" CNC machined alloy cup with ACB (blue seal). The total stack height is 19.8mm (16.9mm + 2.9mm), and the headset weighs 129.6g. Key specifications include: 1.1/8" 36°×45° ACB upper bearing, and 1.5" ACB lower bearing.