Office Star #8511black task office chair. This chair is a multi function fully adjustable office chair. This highback version offers a seat slider with ratchet back up and down adjustment and 2 way adjustable arms to get the most comfortable position to work from. Nylon injected base is strong and lightweight. Back tilt and lock, and front tilt levers help to customize the feel of this chair. High denier fabric on back and seat is plush and durable and simply wipe clean from spills.