The head grade of abalone is based on the number of "heads", that is, there are several per Sima Jin (about 600 grams), which is called "several abalone heads". The fewer heads, the bigger the abalone. For example, "two abalones" means that one abalone weighs half a catty (about 300 grams), and the default is the net weight of dried abalone.

In addition, the order of collagen content in abalone meat is muscle harvesting.