Primos "High Roller" Duck Call - Never before has producing the rolling, fluttering whistle of the pintail been done so easily. The roller built into the High Roller makes the whistle flutter automatically just like the whistle of ducks. The High Roller also reproduces the mallard drake grunt and whistle of the widgeon and teal. Built in roller bar that makes the fluttering whistle automaticallyProduces the whistle of the pintail, mallard drake, widgeon and teal