The basics Senna Sketch-A-Brow Pencil is an ultra-fine point brow pencil, in true-to-color shades, with a smudge-proof formula. The benefits Designed with a never-sharpen retractable tip and blending comb. The uses This professional tool let's you create faux brow hairs, softly fill-in and define as well as enhance brow arches for natural looking definition.  The bottom line Natural looking smudge proof formula stays put until you remove it.