The classic Mallard Hammer has a Cajun-style double reed system. It's slightly shorter barrel, mid-sized exhaust port, and thick-wall insert gives it a slightly raspy tone. The Mallard Hammer has double O-ring construction for enhanced air flow and back-pressure. It is fitted with a gunmetal band and tuned for flawless performance.
Hear the soundfile at the link below!
Mallard Hammer Poly Cajun Style Double Reed Duck Call - YouTube