Designed to bridge the gap between the 40 and 110-series headsets Contoured and relieved 6061-T6 aluminum for minimized weight and maximized strength Low-friction upper bearing seal completely seals cup from contaminants and is fully captured by the top cover with no loose parts. Premium, sealed stainless-steel Hellbender bearings Dual-Seal crown race provides excellent seal efficiency with low friction Carbon friendly compression ring and Interlok spacer compatible TECH SPECS