These films are chewy in the mouth and look edible, but these parts are usually unpalatable, so it is not clear what material they are made of. Generally, sausage makers in rural areas are casings made of pig intestines. This kind of natural casing is not only low in cost, but also healthy, safe and hygienic, and tastes better. If you only cook sausages and there is no casing outside, you will lack that kind of delicious food.

Most of them are made of chicken intestines, because chicken intestines are thin and delicious. Moreover, chicken intestines are much simpler to clean than pig intestines. Pig intestines taste very heavy and contain a lot of oil. There is a lot of white adipose tissue in the small intestine of pigs, which will taste much worse if it is not cleaned.