This is the original / Classic Herman Miller Aeron chair with graphite/black frame and carbon/black mesh seat and back in Size “B” (medium). These chairs were used in an office setting for around 3-4 years, and then were placed in storage for a few years, and they look “close to new”, showing very minimal wear. Features height adjustable arms, swivel arms, forward tilt, tilt limiter, and PostureFit lumbar support. These chairs feature the “clip” adjustable arms (shown in 5th picture). Other chairs with the “thumbwheel” adjustment are older than this model.