Joint protectors do a lot of things for you. First, the sharp exposed edges of a pool cue joint collar are susceptible to damage when your cue is broken down. Joint protectors will eliminate the risk of damage to the collar when installed. Protectors also protect the threads of the joint, and help reduce the chances of a joint pin bending. Furthermore, joint protectors will greatly reduce the wear and tear on the inside of your pool cue case, not to mention making it easier to remove your shaft from your cue case.