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This is an FSA Zero stack upper headset for 1-1/8" or tapered steerer. The stack height is 13.1mm.
Specifications: Model: Orbit Z Upper SHIS Upper: ZS44 SHIS Stem Clamp Diameter: 28.6 (1-1/8") Stack Height: 13.1 Bearings: Angular Contact (36 x 45°) Color: Black