Cane Creek 10-Series Zerostack Short Cover Top for 44mm Head-Tube (1-1/8-Inch Stem Clamp Diameter), Black 6061 T-6 Aluminum Bottom Cup and Covers, Polymer Top Cup Lightweight Polymer Compression Ring Internal Parts Are Cross-Compatible Across 10, 40 and 110 series Tops Sold Separately As Part of Cane Creek's Tapered Headset Solution Headset Fitment Assistance - www.headsetfitfinder.com