`- 10-Series Solutions: separate top and bottom headset cup assemblies for tapered, reducer and conversion applications (mix & match system helps reduce inventory overlap)\n- Same features as the 40-Series headsets with simpler machining and more economical materials\n- Top assemblies include star nut and top cap, while bottom assemblies include crown race\n- Please see: www.canecreek.com/headset-fit-finder for fit information