Collagen Sausage Casings are made from an edible material and are a popular choice when making snack sticks, brats, and smoked sausages. These casings cannot be pre-soaked, so they are ready to use straight out of the package. Collagen Casings take the place of using natural hog or sheep casings. They can be used for fresh or smoked sausages. They are made from beef protein. There is no preparation necessary. Just put them on your stuffing tube and before you know it, you will have uniformly sized sausages!