The Replacement Cylinder is for Herman Miller Aeron chair and is designed to provide the same performance as the original cylinder. Pneumatic heavy duty Cylinder is a Class 4 with a weight capacity of 200 k/440.925 lbs. Gas lift cylinder made with high construction industry standard (BIFMA Plus Qaulity) for Herman Miller Aeron Chair cylinder, ref code 1B08VM B/C. It is made of a durable steel material and is designed to last for years of use. Cylinder replacement for Classic Herman Miller Aeron Chair Size A, Size B, Size C. This cylinder can be easily installed and replaces all parts of the original cylinder, removal & installation video is available upon request. Please check the cylinder by opening the mechanism box under seat before purchasing. If the Cylinder has a cable plastic actuator on the top of the cylinder that this version will workable. If the Cylinder has a cable pin hook on the top of the cylinder that this version won’t work. Brand new Replacement Seat Pan for Herman Miller Classic Aeron, size C (3 dots). Seat pan w/ seat foam for a size C chair which is the largest size chair. Does not include mesh. Have many available so ask for bulk pricing if you need many. These are high quality and garanteed perfect fit.