Size b aeron classic with adjustable armrests and lumbar support. Gently used and in perfect working condition. Very minimal signs of wear almost exclusively on the base with minor light scuffs. Great, comfortable, luxurious, most-in-demand office chair on the market. In my opinion, this is the best task chair available, but that’s just my opinion, which may or may not differ from yours. Thank you very much and ask any questions if you have them, I’m more than happy to help.