Four Call Elk Mouth System with Sound PlatesThe Primos Elk Select Mouth Calls 4 Pack reproduces full herd sounds with Sound Plate technology that automatically positions each call. Includes Sentry Plate Single, Ivory Plate Single, Imperial Plate Double, and Hyper Plate Double for cow calf and bull bugles. Four mouth calls included Sound Plate positioning system Produces cow calf and bull sounds Includes single and double reeds Complete herd calling range