Size B Seat W Mesh ONLY for Herman Miller Aeron Office Desk Chair OEM. The pictures show the chair still in the side chair but I have taken it out. OEM and all real Herman Miller. Great shape with the upgraded web sides for more strength. The female screws for the bolts of the side are also the newer type.

Size A Seat W Mesh ONLY for Herman Miller Aeron Office Desk Chair OEM. The pictures show the chair still in the side chair but I have taken it out. OEM and all real Herman Miller. Great shape with the upgraded web sides for more strength. The female screws for the bolts of the side are also the newer type.