A catty of tripe is only 4 taels after it is cooked, because water will be boiled when it is cooked. When the tripe is cooked, it will be boiled out, leaving only the crispy cooked tripe, which is not easy to cook for too long. If it is cooked for a long time, the tripe will get old and the weight will be less, leaving only half. It's hard to bite a hairy belly that is too old, and its taste is far from normal.