Created for riders seeking to lower their handlebars further than the standard stack height without compromising bearing seal and proper preload7075 T-6 Aluminum, contoured and relieved to minimize weight and maximize strengthLow-friction upper bearing seal completely seals cup from contaminants and is fully captured by the top cover with no loose partsIS41/28.6|Black28.634304.6mm36°/45°1-1/8`UPC/EAN/GTIN: 840226146553