Two-headed abalone is an ordinary abalone, but its size is relatively large. The bigger the abalone is, the more valuable it is. Two-headed abalone means that there are two in a catty, each weighing only half a catty, and so on. Three-headed abalone means three or two, four-headed abalone means two and a half, and five-headed abalone means two or two. The same can be said for prawns. For example, there are ten shrimps in a catty, which may be 40 yuan a catty, but if there are six shrimps in a catty, it may be 80 yuan a catty, which is also a catty. The bigger the shrimp, the more expensive it is. There is a saying in Guangdong that "it is difficult to buy two abalones with money", which means that abalones of half a catty are rare, so things are rare!