Ultra-thin liner brush that is perfect for creating a defined line on the lid or in the waterline. The tightly packed bristles give you ultimate control to create defined looks with ease. Use with Precision Gel Liner. Pro Tip From Illamasqua Head Of Artistry - Pablo Rodriguez: Position the brush at a 45 degree angle against your eyelid, and apply the liquid or gel liner going across the lash line from the inner corner to the outer one. If you went too far, dip a cotton bud in makeup remover, and re-sharpen the ends.