While faux mink tends to be the most popular material for eyelash extensions these days, there actually several different kinds.
These are the most popular extensions used by lash artists today. These man made, poly-fiber lashes come in a variety of lengths, diameters and curls, have good flexibility and remain somewhat natural looking depending on the length. They're designed to imitate real mink fur, but lash artists and clients both love this of extension type because the curl is permanent and they're low maintenance. No need to curl or put mascara on these type of extensions. The Faux Mink lashes are a little more bold, slightly glossier than the Silk and Mink. Because of their variety of size and length they're great for customizing different looks for each client.
These are the mid-weight type of lash extensions, and are finer and more flexible than the synthetic type which makes their retention slightly better. Because of their lightweight they are good to use on older clients or clients with weak and flimsy natural lashes. Like synthetic lashes, silk come in a variety of curls and lengths. These types of extensions also hold their curl but the curl tends to be less uniform then synthetic lashes, making them better for clients looking for a more natural look. Silk lashes tend to be thicker than any other type of extensions and also have that rick black color. They tend to be the least comfortable type of extension and are best used for special occasions.