Large 4 Ounce Bottle More time was spent developing this lure than any other. It's easy to make a call lure with just a “skunky” smell but we wanted much, much more out of this one. When you crack the cap, you will certainly smell skunk but underneath you will detect a sweet odor consisting of a generous dose of castor and muskrat musk. To top it off,there are a couple more special agents and put it up in a thick base so it hangs in there a long time. Use Gusto above your set during warm weather and directly at your set when it starts to cool down. Made for red fox, grey fox, coyotes, bobcats and for you marten and fisher trappers