Benefit Brow Microfilling Pen - Light Brown. 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, different lengths, mimics naturalness, easy application, waterproof, smudge-proof. Application: Sweep the 3-pronged tip over clean, dry brows in short upward strokes. Turn the pencil to the side and draw a single fine line with the edge of the tip.