These are Eames Aluminum Group Management Chairs, model EA335, originally designed by Ray and Charles Eames for Herman Miller in 1958. These particular examples were produced in 2007. Their design features a 5-star aluminum base on castors with a seat upholstered in an ivory leather. They have a tilt feature with locking capability, and a full 360-degree swivel. These models feature a manual lift mechanism. The listed price includes one chair and there are eight available to purchase. Each chair measures 21.25 inches deep, 22 inches wide, and 33 inches high with a seat height is 18.5 inches. Condition is very good, but the leather and aluminum base do show some wear. Arms look terrific and near mint. Please see photos.