Is your classic Herman Miller Aeron chair slowly sinking or stuck at one height? This heavy-duty gas lift cylinder is the fix. It's designed specifically for Size A, B, and C Aeron chairs made between 1996 and 2012 (look for reference code 1B08VM). This Class 4 rated cylinder is built tough, supporting up to 450 lbs with a smooth 6-inch height adjustment range. Installation is pretty simple – you'll usually need a pipe wrench or a special removal tool to get the old one out, then this one pops right in. No more annoying sinking! It comes with a 5-year warranty for peace of mind. Get your premium office chair feeling brand new again.