Buck Gardner"s "SYSTEM" is a combo pack that gives you everything you need to get started. This combo includes our Mallard Magic duck call, the 6N1 Pintail Whistle and the "Straight Talk" CD that will teach you how to accomplish all the different mallard calls: from quacks to hail calls and rolling feed calls to the sweet lonesome hen call. Why buy these separately when you can get them all together for one low price?.