Item DescriptionFSA"s core line of headsets that have become an industry benchmarkDual seal, angular contact bearings provide long lasting, smooth rolling performanceForged and CNC machined 6061 T6 alloy cupsIS: 36x45 degree Cane Creek Integrated, CF: 45x45 degree Campagnolo Integrated, ZS: Zero Stack shallow, Z: Zero Stack deep, or Xtreme-Pro, X, MX, XLII, UF, DL: External Cup, traditional available for 1", 1-1/8", tapered and 1.5" applicationsItem Specificationsmodel: Orbit ZS.H.I.S.: ZS49/28.6|ZS49/30stack: 7mm/3.5mmcolor: blackweight: 140g: