Generally speaking, there are many specifications that can be referenced at present. The conventional size is a transparent plastic box containing matching related molds, including blank mold of embryo cake, pressed plastic mold and sealed commemorative badge. Special-shaped size is usually the specified size, and there is no matching mold and transparent plastic box mentioned above. For example, the diameter of 40mm belongs to the conventional size, and the diameter of 4 1mm belongs to the unconventional size, which is what we usually call the special-shaped size.