Crafted using state of the art injection molding technology, Zink Calls Thunder Ridge Series Friction calls guarantee you’ll find the same quality and consistency not only in every call, but in every note. Whether at 150 yards or 15 feet, these innovative calls provide a fantastic range of sound. The Thunder Ridge Series friction calls include a two-piece hardwood striker and a surface specific conditioning pad. They also sport the popular E-Z Gripper Ring and built-in Striker conditioning pocket.