The original diaphragm elk bugle, the Blue Double Reed is our biggest seller. It produces a complete range of elk sounds, from cow calls to mid- to long-range bugles, without ever intimidating smaller bulls. Reliable, realistic, and hands free, it features durable Infinity Latex, which absorbs significantly less moisture for long-lasting performance. If youre going to use diaphragms to call elk, use the ones designed by the man who revolutionized the art of calling elk.