These are Eames Aluminum Group Desk Chairs, Model EA308, initially designed by Ray and Charles Eames for Herman Miller in 1958. These particular chairs were manufactured in the 1970s. The design features a lightweight aluminum frame with a 4-star base, and they are upholstered in black naugahyde. The chairs also have cast "antler" bases, as opposed to the adjustable bases, and therefore do not tilt or adjust up and down. The listed price includes one chair, and we have two available for purchase. Each chair is 21.25 inches deep, 22 inches wide, and 33 inches high with a seat height is 18.5 inches. The base and seat both show signs of wear as expected from use, but overall they are in good to very good condition. Please see photos.