The Cuetec Joint Protector is made to protect the essential parts of your cue to extend the overall life. Even if you store your cue in a good case, the collar, joint, and pin are still exposed to damage. The Cuetec Joint Protector will protect these essential parts. Works with Cuetec cues and other cues with a 3/8 x 14 joint pin (does not work with Quick Release joint).