Pro Series JP-18M Wooden Birds-Eye Maple Joint Protector Set, 5/16 x 18 Made of beautiful natural Birds-eye Maple 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 Also available in exotic Cocobolo