Now hunters of all skill levels can add diaphragm calls to their elk calling arsenal with Wayne Carlton's Calls® new Tone Trough diaphragm line. It's a revolution in elk diaphragm calling, says Wayne Carlton. The built-in sound chamber, or tone trough, allows hunters to blow the call using less pressure while achieving great sounds. Every Tone Trough call is made using high-quality Infinity Latex®, which is easy to blow and has superior durability to all other types of latex on the market. And because less pressure is required, the life of both the reed and the call is prolonged. Equipped with a Premium Flex? frame to ensure consistent fit and stretch from call to call, Tone Trough's sound chamber produces the highest pitched elk bugles and most authentic, nasally cow calls on the market. The one thin reed on the Single Reed creates authentic young cow moos and calf vocalizations.