The original color-coded diaphragm system from Wayne Carltons Calls is still the standard by which other elk calls are judged. The Beginner Red Single Reed produces cow/calf and young bull sounds and is a great call for beginners. The Super Blue Double Reed produces everything from cow calls to mid- and long-range elk bugles. The Herd Bull Triple Reed produces deep, nasally cow calls and loud, deep-tone bugles. The new Cow & Calf call rounds out the pack. Made with moisture-resistant Infinity Latex and an aluminum frame that allows for custom fitting to the users palate, it comes with a durable plastic call case.