Pro Series JPA-18 Threaded Aluminum Joint Protectors Made of solid aluminum for durability Joint protector set comes with 1 make and 1 female piece made to fit both exposed ends of a 5/16 x 18 cue The number one way to protect your cue's joint collar and joint pin High quality design fits tightly and won't come loose Available in your choice of 4 colors: psycho silver, blacktastic, badass blue and passion pink