SF130GR Frost Bite Single Reed Duck Call was designed for that higher pitched tone on those frosty mornings, for the guy who prefers the ease of a single reed or the guy who likes his calls to cut the air. From hunting corn stubble fields or open water, this duck call will produce those higher pitched vocal calls and screaming comeback calls all the way down to soft whiny quacks and feed chuckles. Takes very little air to operate.