Benefit Precisely My Brow Pencil. Get stunning, precisely defined brows with Benefit's Precisely My Brow Pencil. It delivers rich, natural-looking color coverage with a long-lasting, waterproof formula. It comes with a professional-grade brush that helps you easily comb through brows for perfect results. Features: Rich color to define and fill brows. Waterproof formula that lasts up to 12 hours. Precise design allows for easy shaping. Professional-grade brush for natural-looking brows. It gives the appearance of natural, full brows. Directions: Use the pencil to define brows starting from the inner corner to the end. Fill in sparse areas using light strokes to mimic natural hair. Use the brush to comb through and blend color.