Elite Headset 1 Threadless Black EC30/25.4 EC30/27This top of the range headset comes with a 3 year manufacturing warranty Precision CNC alloy cups made from aircraft grade aluminium Quad sealed precision angular contact bearings coupled with double sealed bearing housing, keeps the British climate at bay Utilises flush seal technology to further protect the longevity of the bearings Full spares back up available Expanding collar design means once you tighten the headset, it stays tightened Low stack