Herman Miller Aeron Seat & Back Mesh has run B office chair armchair Black 1bgs. The seat & back mesh snaps into the frame on their office chair armchairs, it is carbon black with a gray trim ring. We sell over 100 different used parts. Please let us know if you have any questions. Pre-owned, needs deep cleaning, seat mesh has a run near in one front corner. Shows wear, scratches, paint specks, and has discolorations that may need touch up paint, but will work on your chair. This is for one seat and back mesh size B medium, and is a genuine OEM part for the Aeron furniture line by Herman Miller. 127 W Fairbanks ave, #254 Winter Park, FL 32789.