The Rocky Mountain Wapiti Whacker Bugle Tube allows you to create all the sounds and display calls of a bull elk. This elk bugle tube features the innovative V.E.T.T. system that creates built-in back pressure for easier calling. The V.E.T.T. system also adds a spring to the front section of the call to create more volume and better stabilize higher sounds. The Wapiti Whacker bugle is optimized for deep, raspy chuckles, growls, and grunts and is rubber coated to eliminate plastic vibration sounds. Plus, an included enlargement ring allows hunters to expand the mouthpiece from 1.25 to 1.5 inches. One of the most realistic sounding elk grunt tubes available, the Rocky Mountain Wapiti Whacker Bugle Tube creates a full range of elk sounds from high-pitched squeals to raspy grunts and growls.