The flexible practice head is ideal for continuing to develop and train yourself on lash extension skills. The advantage of these flexible eyelids is that the eyelash strips are already incorporated into the eyelids. This allows you to clearly see the hairlines, and you can practice even better on placement at the roots and preventing stickies. Also, the bristles of the eyelash strips are similar to real eyelashes, so the eyelash extensions adhere better.