The Herman Miller Aeron Office Chair in Black is a high-quality desk chair designed for maximum comfort and support during long hours of sitting at a desk. Made by the renowned brand Herman Miller, this classic Aeron model is known for its sleek design and ergonomic features. It provides a smooth and adjustable sitting experience, making it ideal for businesses and individuals who prioritize both style and functionality in their office furniture. The black color adds a touch of elegance to any workspace, making it a stylish and practical choice for office environments. Ps i have a class B and A, the A is brand new and the B is used but new.