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 Cow & Calf call has one and a half reeds for the most realistic young cow moos and calf vocalizations.