This is a heavy hard plastic “old style” joint protector with a TIP PIK. Has metal threads. Very solid.
Actual item could be any configuration of the attached pictures.
Fits standard Joss, Balabushka, Peachaur, Jacoby, Falcon, Helmstetter, Action, Predator, Schon, etc.
**We cannot guarantee that this will fit your cue unless it is actually a 5/16-14 thread type.