Higgins inTune Duets stuffed treats, combine two tasty textures ferrets love: A crunchy outside shell with a soft treat filling. inTune Duets are also free of any artificial preservatives, colors, flavorings and do not contain added sugars. At Higgins, we understand the importance of quality nutrition. That’s why our inTune Duets for ferrets are crafted using chicken meal as the number one ingredient, ensuring a high protein content that supports a ferret’s active lifestyle. Our inTune Duets Chicken Meal & Salmon adds the salmon flavor ferrets love.