Cane Creek 40 ZS44/28.6 EC44/40 Headset BlackThe 40 Series is the workhorse of Cane Creek's headset line up. Representing the balance of performance, durability and value, the series incorporates all the features necessary for a robust, lightweight, long lasting headset. Zero stack uppers press into head tube with very little stack height. Lowers are either zero stack or external cup. Sealed black oxide bearings Carbon friendy compression ring captured in top cover, keeping shims in place Steel