This is a good working condition Aeron by Herman Miller in black in the "B" size. It has height, seat tilt/lock, front knee tilt and lock, and adjustable height arms. The pellicle is unflawed, but there is a very small nick in the seat's pellicle framework along the front edge. The base is cosmetically flawed, with lots of scratching. We are selling it for $309 due to the cosmetics. We also have some Aerons with the brushed aluminum base for $549 each, and lots of other premium chairs in our warehouse.