"Named in honor of one of the most popular WMAs here in Arkansas, the Hurrikin series of calls offers the hunter a modified tone board with ""spit grooves"" to help combat sticking of the reed due to moisture buildup. They also give the option of setting up the call as a single or double reed, which makes it basically two calls for the price of one! ""Big Hurrikin"" has a larger exhaust which produces higher volume range, while still allowing the caller to back off air pressure to produce soft quacks and whines to show finesse when the ducks are close. Hurrikin has the blend of raspiness and purity of tone that a mallard duck can't resist! Just choose whether you want it to be setup as single or double reed and we will send you the materials to convert it. choose initial setup as single or double reed. you will receive included materials to change setup as desired."