Very upset with the outcome. The pieces for this chair did not come in full and/or came damaged. Two of the five wheels are damaged with broken pieces. 2 screws were missing from the back part (N), a missing screw for the arm so it wobbles... I could not put the chair together properly. I feel that it was a pretty expensive chair that is supposed to bring comfort to your workday. For the price I paid I feel that I did not get what I wanted. If I get the pieces I need I would write a new review to indicate if it was what was missing to make the chair the ultimate comfort for work.