Benefit Goof Proof Brow Pencil Super easy brow-filling & shaping pencil 4.5 Natural Deep Brown. Full Size $27.00 Value 0.34 g Net wt. 0.01 oz. BNIB Goof Proof, the buildable brow pencil that glides on smooth as butter, so filling and shaping your brows is a total breeze. Plus, it’s waterproof and smudge-proof. Turns out work-of-art brows can be achieved on the first try.