This is a full set of threaded action (hinge) rods, rod screws and key pivot screws for a Yamaha tenor saxophone. We also sell sets for Alto sax and Bari sax. This set is specifically for the YTS23 tenor sax. However, many of these rods and screws will work on other Yamaha models as well. This entire rod and screw set is cheaper than one trip to most local repair shop to replace a rod or screw.