The production process of Defula protein casings uses collagen as raw material. Collagen casings are a type of edible breathable casings. They are generally made from the dermis, tendons and collagen of animal skins. They are rich in collagen, which can increase the elasticity of the skin and delay aging. It can also play a role in Strengthens muscles and bones and enhances physical fitness. The properties of collagen casings are similar to natural casings, but at the same time they are easier to produce than natural casings. Due to the limitation of the production of traditional natural casing products, the supply of casings in the market exceeds the demand. The emergence of collagen casings solves this problem and has the incomparable advantages of Tianre casings, which is very popular among users.