Taming eyebrow pencil. A dual-purpose brow tool for the perfect line: a precision pencil to redefine the brow line and a spiral brush to tame the brow. Dessin Des Sourcils The Ultimate Dual-Ended Precision Eyebrow Pencil 4 Ash YSL. This deluxe dual-ended precision pencil with companion brush shapes, shades and defines brows for a beautifully natural look. The velvety smooth formula glides on effortlessly for gorgeously groomed brows. Ophthalmologically tested. Suitable for sensitive eyes and contact lens wearers.