These are Knoll Executive Side Chairs, originally designed by Richard Sapper in 1979. These particular examples were produced during the years 2005 to 2007. They are comprised of a steel frame with a seat upholstered in black leather. The listed price includes one chair and there are 17 available. Each chair measures 27.5 inches deep, 24.75 inches wide, and 34.75 inches high with a seat height of 19.25 inches. The chairs show some minor wear on the leather and frame but overall are in very good condition. Please see photos.