Brush no 13. Brand new. Authentic Delivers a precise, firm, even stroke, which is ideal for creating a flawless line! Use the reverse side of the brush to create a full Tightliner™ effect. Start at the root of your lashes, wiggle and sweep wand through to the tips of your lashes. Finish by pressing the wand along the base of your lash line to fill in the gaps and make your lashes look longer and thicker!