For over 25 years and have found some unique items for my collection. First time offered City of Chicago flag Aeron mesh back. This was custom made early 2000 for City executive officials. This is not painted as it is woven into the pellicle using 2 colors of polyester. Herman Miller supposedly never made any custom mesh but someone. Who had access to their proprietary manufacturing process made this mesh back. This is for a size B, medium chair. Please ask any questions you may have regarding this item.