Cups and covers made of 7075 T-6 Aluminum, made in the USA Internally 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 partsDual-Seal crown race provides excellent seal efficiency with low frictionPremium, sealed stainless-steel bearingsMade In USAIS41/28.6|IS52/40Black28.641/5240101-1/8` to 1.5`UPC/EAN/GTIN: 840226077703