Single Lashes J Curl 0,15 mm. Volume Up! Eyelash Extensions significantly seperates from others with their dark black color, shiny surface and xtra volume. They will bring full volume to your natural lashes and make You look like You were born with beautiful, lush lashes. They are made of 100% sterilized human hair, each lash strip is knotted and feathered by hand to achieve the highest quality possible. When used with B4beauty Eyelash Glue, they are easy to apply, comfortable to wear and stay secure for up to 2 months or until you take them off.