Aeron Chair by Herman Miller - Highly Adjustable - Graphite Frame - Lumbar Pad - True Black (Large) Pellicle Made in USA 12-year Herman Miller warranty with Born-On-Date sticker. The new benchmark in the arena of ergonomic office, seating Highly Adjustable Mode: Adjustable Arms, Lumbar Support, Tilt Limiter and Seat Angle Adjustment, Tilt Limiter