Precisely My Brow Pencilâs ultra-fine tip makes adding definition to brows easy. It lets you draw incredibly natural-looking hair-like strokes that last up to 12-hours. This rich waterproof eyebrow pencil is ideal for spot-filling sparse or over-tweezed areas and the smudge-proof formula is firm for precise application. Brow pencil to transform shapeless undefined brows with a few strokes-now available in 12 shades to flatter every hair color. This ultra-soft brow pencil features a 12-hour waterproof formula that features a no-trimmer tip on one end and a built-in spoolie brush on the other end. Create stunning natural hair-like strokes. Provides rich color to fill in and define eyebrows.