The Adrenaline is a high performance goose call that was designed to execute advanced note combinations. It is deep on the low end with a very sharp "crack" on the top end. Perfect for contest callers and guys that need volume and appreciate great realism. All Adrenaline Goose Calls come with the Field Proven "Mark 2 Semi Worn Gut" system. The Mark 2 guts have a slight, semi wear line in the tone channel that increases the tonal qualities to a rich, full sound. The semi wear line is a jump start to wearing the guts in properly but still allows the caller to wear in their own set of guts for long term use. Includes a DVD with over an hour of instruction to enhance your goose calling skills. Standard Gut System: FP Mark 2 Semi Worn Guts Optimum performance conditions for Adrenaline use: Contest calling, high wind days, hunting migrators, on water, no wind days, heavily hunted geese call shy geese, hunting large and medium size subspecies of Canada Geese, running traffic. Call stiffness and air pressure required: Ideal air pressure and tuning is light medium, medium, medium stiff, and stiff.