Simple. Versatile. Dependable. The A-Frame call uses a patent pending process to trap the reeds and keep the perfect tension, so the call will continue to sound great over time. The A-Frames are contoured to fit your mouth, not flat like other calls. The Sonic Dome has been designed so the call is automatically positioned correctly in your mouth. The Sonic Dome creates its own sound chamber, for an incredibly consistent sound. Youll be amazed at how easily the calls in the Cutter 3-Pak are to use. These calls will do it all.