The Antagonizer™ Grunt Tube is engineered with a dual acoustic sound chamber for the ultimate in realistic elk bugles, elk grunts, and elk chuckles. The two-inline chambers are separated by a rubber gasket to cut down vibration and eliminate the plastic sound you get in some elk grunt tubes. The gasket canal creates great backpressure for elk grunting and elk chuckling. This lightweight tube is the perfect size to carry in your pack or on your shoulder in any condition or terrain. You get the ultimate sound of the large tubes in a nice easy to manage size. No detail was overlooked in this design… beautiful tight non-slip cover, embroidered patch with the Mile High logo, a grommet for your lanyard going through the tube, lanyard canal to sink the lanyard into the tube near the mouthpiece. Lanyard installed.