Carlton's Alumni Pack Elk Diaphragms - The Alumni Pack Aluminum Frame Elk Diaphragm has a Beginner Red Single Reed produces cowithcalf 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 user's palate, it comes with a durable plastic call case. Color-coded diaphragm systemGreat call for beginnersProduces everything from cow calls to mid- and long-range elk buglesMade with moisture-resistant Infinity Latex Aluminum frame