Genuine Herman Miller Aeron Office Desk Chair – MEDIUM SIZE B. Open Box Genuine Herman Miller Aeron Office Desk Chair – See pictures of the actual chair for sale. This is a Genuine Authentic Herman Miller Aeron Chair. Aeron Size B – Posture Fit, Polished Aluminum, Classic Carbon Pellicle + Black Leather Armrests. See pictures for exact chair for sale in this listing. You can come see and test the chair in our San Diego (Poway) showroom. We accept most major credit cards in our showroom.