Stila's innovative, double-ended brow pen features two complementary shades to expertly sculpt and fill in eyebrow hairs for natural-looking, flawless eyebrows. One end of the pen includes the precise Stay All Day Waterproof Brow Color felt-tip applicator to draw hair-like strokes, while the other end provides a four-prong brow applicator to fill in and blend color into brows.