You get to choose your eyelash extensions from a wide variety. From vegan lash extensions to synthetic stuff, there are different types of eyelash extensions that can suit your eyes. As a client, it is up to you to select the length and width of your lash extension. Normally, a professional beauty expert gives you the option to select your lash size from 7 to 17mm. You can also adjust the thickness of lashes from 0.05 to 0.025mm.