There are many kinds of packaging materials, such as food-grade plastic film for casing; there are very thin sausages, most of which are made of chicken intestines for casing; there are also slightly thicker kinds of sausages or grilled sausages, which are made of pig intestines for casing. Then in the consumption of attention, if you feel the sausage outside the thicker casing, we must use the hand to peel off, can be eaten; on the contrary, if it is difficult to tear off the sausage casing by hand. Then it is basically edible.