The Knock Down Diaphragm Elk Call is a very versatile elk call that is essential in your pack when chasing big bulls. The Latex design allows you to sound like bull elk and cow elk. Delivering Medium grunts and high pitched bugles in multiple fashions. Designed in a single, double and triple reed. Progressively getting a litter deeper in tone as you add a reed. The Triple reed is an excellent choice for the hunters choosing to produce deep, guttural sounds of older bulls, raspy bugles that can pierce the thickest timber stands, and mimick the cow elk that those big bull elk chase.