7075 T-6 Aluminum Cups and Covers; Internally Contoured and Relieved Cups and Covers Minimize Weight and Maximize Strength; Dual-Seal 7075 T-6 Aluminum Crown Race for Maximum Sealing Efficiency; Low-Friction Top Cover Seal Completely Seals Cup from Solid and Liquid Contaminants; Updated Compression Ring Design Further Enhances Carbon Friendly Uses by Evenly Distributing Clamping Forces. on the Steerer