Herman Miller Aeron Classic Chair – Size B (Medium) – Graphite/Black – Excellent Condition. Upgrade your workspace with the iconic Herman Miller Aeron Classic-ergonomic, durable, and built for all-day comfort. Condition: Excellent (all functions working perfectly). Weight Capacity: Up to 350 lbs. Smooth, responsive adjustments throughout. This chair is fully functional and ready to use-no issues. Steelcase Gesture Chair.