The Primos Hook-Up Magnetic Box Call is a must-have for any serious turkey hunter. As far as box calls go the Primor Hook-Up Magnetic Box Call is right there at the top. The rare earth magnet located on the top of the box call is what holds everything together. The magnet is incredibly strong and helps to give more accurate calling and ease of use.As the magnet holds everything in place, your sliding becomes more controlled and you'll get more accurate pitches and rhythms. Soft yelps, cuts, clucks, and purrs are all richer and easier to make with this magnetic box call.