When choosing the length of false eyelashes, it needs to be decided according to the individual's eye shape and makeup needs. The difference between 12mm and 13mm false eyelashes is mainly the length. 12mm false eyelashes are shorter, and 13mm false eyelashes are longer. If you want false eyelashes to blend into the eye shape more naturally, you can choose 12mm style. If you want false eyelashes to stand out more, you can choose 13mm style. In addition, the length of false eyelashes also needs to be selected according to the individual's eye shape and makeup. For example, if the eyes are small, you can choose a slightly shorter false eyelash; If your eyes are bigger, you can choose a slightly longer false eyelash. At the same time, makeup will also affect the choice of false eyelashes. For example, you can choose slightly longer false eyelashes for heavy makeup and slightly shorter false eyelashes for light makeup. In short, the choice of false eyelashes needs to be decided according to personal circumstances, including eye shape, makeup needs and personal preferences.