Ellipse/Flat-Black Matte Mixed 12-15mm 0.20 Curl--C . Ellipse or Flat Eyelash Extensions are elliptical in shape and have a flattened based at the root and taper at the tip. They are easy to apply and have long retention time. They are the perfect solution for clients who want a thicker, fuller look without added weight. Use them for filling in openings in the lash line and with hybrid applications.