The 40-Series sets the standard for performance, durability and value.  Drawing from the Premium 110-Series Design, the 40-Series incorporates all the features necessary for a durable, light-weight, long-lasting headset.   To make it easier, we developed consistent graphics, interchangeable parts and over 40 configurations to meet almost every need.  Sold in straight and tapered assemblies or tops & bottoms, Cane Creek's 40-Series offers the largest fitment range of any headset line on the market.   Precision engineered by Cane Creek in Fletcher, NC. Cane Creek 40-series Upper ZS49/28.6: 40-Series Solutions: separate top and bottom headset cup assemblies for tapered, reducer and conversion applications (mix & match system helps reduce inventory overlap). Same features and materials as 40-series complete headsets. Top assemblies include star nut and top cap.