Cue Extension Carbon Fiber 4" + 8" inch for "12 total .For Predator Cues. Stackable billiard pool butt. You will receive the 4" extension,  8" extension and 2 screw in bumpers. This is not a predator product but can be used on newer Predator cues that utilize the uniloc weight bolt kit.  Any questions just ask.

You can add to the 4 inch extension only. 8 inch is not Stackable.