These are Sapper Series Management Desk Chairs, designed by Richard Sapper in 1979. These particular examples were produced by Knoll in the year 2000. This is one of Sapper's most iconic works, along with the Tizio lamp. The design features black leather upholstery, and has a metal base with a black finish. The listed price includes one chair and there are 9 available to purchase. Each chair measures 26.5 inches long, 25 inches wide, and 36.5 inches tall with a seat height of 17 inches. These chairs do show minor wear from previous use but overall are in good to very good condition. Please see photos.