DJ Calls K-11 Diver Duck Call Brought back by popular demand is the K-11 Diver Duck Call This old-time favorite slide-type 3-in-1 call was the finest among the diver duck hunters The call is marked Bluebill, Redhead, and Canvasback, and the slide tube allows hunters to change the tone of the call The call is also sought after also by sea duck hunters The call is made out of plastic and is 4-1/2 inches closed and 6-3/4 inches open