What does "twelve sea cucumbers" mean? Why do you want to start?

head is a quantifier for sea cucumbers, which is similar to the number of eggs. How many heads generally means how many heads there are per 5g, for example, 3-5 heads, which means that there are 3-5 heads per catty of sea cucumbers. Because the sizes of sea cucumbers are different and the prices are different, how many heads can roughly analyze the grams of sea cucumbers per head, which is like saying that there are 7-8 eggs per catty, which means the same thing.