Size A (smallest size) Herman Miller Aeron Desk Chair with adjustable headrest. This is a chair that has been completely refurbished. That means it has been completely taken apart and checked for worn or broken parts and if found those parts were replaced with genuine Herman Miller Parts. It is in new working order and has been touched up so it is almost new again. There might be some very minor scratches on it but you would be hard pressed to tell it is used. It is the adjustable version with up and down, tilt back restrictor, tilt forward and adjustable arms up and down and in and out and has lumbar support. It is black or graphite color and the wheels work on hard and carpeted surfaces. This is a great chair.