A friend gave me this chair. I decided I dont really need it. These chairs sell for $500 or more online. It is fully adjustable. This one has a broken seat see photos. The seat is broken at the back where it attaches to the support stays. This could possibly be repaired with epoxy or super glue, but to do would require removing the seat to do the repair. Im not sure my friend even knew about the seat. It still seems to be functional, though it might not function as well as it should. I would not recommend it to a heavy individual until the seat is replaced. Replacing the seat appears to require loosening some bolts. Some mechanical aptitude and a few tools would come in handy. Replacement seats seem to sell for $100 - $149, plus shipping. I am guessing that this is a Size B chair but I am not sure of that.