The product is a used Herman Miller Aeron seat back in size B with a grey mesh design. This office/desk chair is known for its high-quality construction and ergonomic design, making it a popular choice for businesses looking to provide comfortable and supportive seating for their employees. The mesh back feature allows for breathability and promotes better posture while sitting for extended periods of time. Made by the reputable brand Herman Miller, this seat back is a reliable and stylish addition to any office space.