GREAT WORKSHOP HEADSET - 1-1/8",36deg / 36deg ACB - Alloy top cover - Forged alloy upper cup and steel lower cup - Angular Contact Bearings (Black seal) - Stack Height 22.9+12.6=35.5mm - Weight - 116.9g FSA Part number 101-1055 Not sure if this is the one you need? Check out the handy FSA Headset ID Tool here http://www.fsaeasyheadset.com/