Herman Miller Aeron Chair Basic Classic Carbon Graphite Model with Lumbar Support Pad, Fixed Arms and Vinyl Arm Pads - Medium Size (B) Classic Dark Carbon Pellicle Home Office Desk Task Chair 12-Year Warranty covers everything that makes a Herman Miller Office Chair--including casters, tilts, pneumatic cylinders, and all moving mechanisms. Herman Miller Aeron Chair Basic Classic Carbon Graphite Model with Lumbar Support Pad, Fixed Arms and Vinyl Arm Pads - Medium Size (B) Classic Dark Carbon Pellicle Home Office Desk Task Chair Basic Model with Fixed Arms, Lumbar Support Pad, Rear Tilt, Rear Tilt Tension Knob, Graphite Frame and Vinyl Arms. The Aeron chair by Herman Miller is, simply put, the best ergonomic chair you can buy.