What it is: A synthetic-bristle eyeliner brush with a fine, flat head. What it does: Ideal for use with eyeshadow or eyeliner, this brush is designed for the fast, flawless application of eyeliner or eyeshadow to line the eyes. How to use: Use the brush dry or slightly moistened to pick up eyeshadow. Carefully place the brush to the external edge of the eye and repeat the application all along the eyelid to line the eye easily. Over an eyeliner pencil line, apply a dry eyeshadow shade using the method to set the makeup, or smudge the line using gentle backward and forward strokes. Pro tips: You can also use to apply eyebrow makeup with powder textures. Synthetic hair