Newer Style Herman Miller Aeron Office Desk Chairs. Has posture fit lumbar support. Has upgraded heavy duty pneumatic hydraulic cylinder which will last longer than normal hydraulics you can tell by the metal sheath around the post. These are the cleanest and the best shape you can get being a classic. These are newer style classics which means they have the clips for the adjustable arms. The older style have the wheels for the adjustable arms. Fully loaded and just about perfect paint. No blemishes or issues. All mechanisms work perfectly.