This is a Herman Miller Classic Aeron, labeled as #C15. This chair is a size C model, it’s in excellent condition. #C15 has been thoroughly tested, and is 100% mechanically functional. Forward & backward tilt, adjustable lumbar, flip switch adjustable arms, mesh is in excellent condition & has great resistance. Aeron headrest for 60. New Hardwood Floor castors for 20. Please inspect every picture thoroughly, zoom in, zoom out, & don’t hesitate to ask any questions about the chair you are looking at. Because what you see is what you will get. Installation Video: Backrest will need to installed. Installation video on YouTube will be available, via shared link, upon request.