OEM Size B Herman Miller aeron mesh that fits into the seat pan- does not include the seat pan. It has black pellicle mesh and has blemishes on the front area. See Pics for more details.
Herman Miller Aeron Tilt Engine B medium chair armchair New Era With Metal Stop. The internal machine that drives the device, updated version with solid metal instead of the white plastic tilt stop. We sell over 100 different used parts. Please let us know if you have any questions. This is for one size B medium tilt engine that has a black graphite colored knob, and is a genuine OEM part for the Aeron furniture line by Herman Miller. 127 W Fairbanks ave, #254 Winter Park, FL 32789.