Micro precision brow pencil, with built in grooming brush, offers controlled brow filling and lining to quickly and effortlessly impart fuller, natural looking brows. Easy to blend formula lasts for up to 10 hours and creates polished, better defined brows. What's Inside Long lasting formula lasts for up to 10 hours. Vitamins C & E help to keep skin soft. How To Use Start by drawing with small upward strokes following the brow shape, creating the length and angle of the arch.