Finally you can satisfy your Single Lash Extension clients with length and thickness that has never before been safe with these revolutionary Black Flat Lashes. -True Flat lash that is exactly the width that it says it is. -Easy to work with. -Fabulous retention due to porosity. -As light as a single 0.07. -Work well on Clients with fine natural lashes. CAUTION WHEN USING 15/16mm EXTENSIONS. Make sure they are not shedding too fast and that there is a good amount of natural lash growth. If either of these conditions are happening on your client, then you need to apply a shorter extension