The antagonizer Grunt Tube is engineered with a dual acoustic sound chamber for the ultimate in realistic bugles, grunts and chuckles. The two chambers work in unison to create the perfect amount of resonance to amplify those high pitch and guttural sounds of the rutting bulls. Carrying rope included. This light weight tube is the perfect size to carry in your pack or on your shoulder in any conditions or terrain. Designed for use with diaphragm calls sold separately.