Designed to deliver 100% pure duck sound, the Core PureDuck Duck Call from Rolling Thunder Game Calls gives duck hunters a versatile, user-friendly call for their lanyard. A J-frame call with a traditional 1/4" initial bore that opens up to a medium-sized bore, this design complements loud cutdown designs very well.FeaturesVersatile, user-friendly duck callDouble-reed design with J-frameFeatures a traditional 1/4" initial bore that opens up to a medium-sized boreProduces clean tones with plenty of rangeEasy transitions from high-end hails to bottom-end feed calls