Benefit Brow Microfilling Pen - Blonde. Micro-fine strokes for a microblade effect! Fill in gaps and sparse areas to create the illusion of natural eyebrow hairs. Benefits: 3 ultra-fine lines in a single stroke, various lengths, mimics naturalness, easy application, waterproof, smudge-proof. Application: Sweep the 3-pronged tip in short upward motions over clean, dry brows. Turn the pen to the side and draw a single fine line with the edge of the tip.