I was a bit surprised that there were no instructions.  Granted, the assembly is fairly straight forward, except for the black 1 1/2" by 1" thimble item.  I assume it goes on the end of the pneumatic cylinder that inserts in the bottom of the chair.  When I did this, the black plastic cylinder broke in half.  The tapered end of the cylinder seems to fit into the slot on the bottom of the chair.  A set of instructions would help.
Aside from the above issue, the chair sits fine and rolls easily. When the shipment arrived, the box had a large hole in it and the top of the box was ripped open.  Everything inside seemed to be ok.