McDermotts new Engage cue extension features a custom black rubber bumper which contains a quick release female insert. The bumpers stays in your cue just like the OEM one. However, when you need an extension, grab your Engage extension and thread it into the bumper. Adds 11-inches and is as stable as if it were part of the cue!*Engage Cue Extension only compatible with cues featuring Engage bumper.