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The FSA TH-857 1 1/8 Inch headset features 6061 T6 forged and CNC machined cups and alloy top cover and caged ball bearings for a smooth feel.1-1/8" caged ball bearings6061 T6 forged and CNC machined cupsAlloy top coverStack height: 14 + 11.8 = 25.8mmSpares:Top and Bottom bearings: MR013Crown race: H6010