The casings used for ham sausage are animal casings, of which pig casings and sheep casings are common. Pig casing has good elasticity and toughness, can accommodate a large volume of filler and maintain the shape of the ham sausage. The use of pig casings is the traditional method of ham sausage production, and many consumers have a preference for ham sausage made from pig casings; sheep casings are thin, poor elasticity, and more delicate flavor, suitable for making small ham sausages.