This easy blowing double-reed Bill Saunders Original Guide Series Duck Call is hand tuned to match the sound of a hen mallard. With good volume and realistic sound this call is a great choice for any serious waterfowler. Pull them in with a Guide Series Gravity Duck Call. Guide Series custom goose calls and duck calls by Bill Saunders are built to meet the demands of serious waterfowlers everywhere. Successful waterfowl hunting and contest calling require a call with a wide range of tone and volume, and most importantly a realistic sound. Guide Series Calls are hand tuned and tested to ensure you get the highest performance out of your call.