Contains: Your choice of 2oz or 4oz of Duck Gizzards The purpose of Gizzards is to constantly grind up the food consumed by the bird in the place of actual teeth, transforming this organ into a tough and lean muscle For such a small organ, gizzards are high in protein, cartilage, and contains iron, zinc, minerals, and vitamins C, E, B, and B12. They are also high in Glucosamine, which is beneficial to your pet&&';;s cartilage and joints and is often used as a treatment for arthritis! Best Suited For: Cats and Dogs of all sizes! Storage Instructions - If your freezer space is looking a little tight, storing in the fridge works just fine with this item!