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The PHELPS AMP Redis your go-to call for when you get into the big bulls. The Red produces deep and loud bull sounds so you can over power those monster bulls and get them to come running. A rutting bull doesn't like to be out done, and with the PHELPS AMP Red diaphragm call, you'll be able to produce a powerful enough call to compete with the monarch bulls.
The AMP Diaphragms only comes in a size Medium