ZTTO 4444T Bicycle Headset ZTTO code: U Pper cup / Bearing o Utside diameter + Lower cup / Bearing o Utside diameter + Fork tube ("44" for OD ø44, "T" for Tapered Tube fork) ZTTO code is for quick search, no longer exact specifications Please discuss with SHIS (Standard Headset Information System) ZS44/28 EC44/40 If you've any questions on headset stand, please google "headset stand park tool" or contact us MATERIAL: CNC MACHED AL6061 T6 SEALD BEARING WEIGHT: About 126g