Herman Miller Aeron Back & Seat Mesh medium B office chair armchair Purple 2bps. The mesh snaps into the frame on their office chair armchairs, it is purple with a black trim ring. We sell over 100 different used parts. Please let us know if you have any questions. Pre-owned, needs deep cleaning, 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 & back mesh size B medium, and is genuine OEM part for the Aeron furniture line by Herman Miller. 127 W Fairbanks ave, #254 Winter Park, FL 32789.