Achieve denser, thicker eyebrows with the Ultra Slim Brow Definer from premium English brow specialists, BBB London. Infused with nourishing and conditioning ingredients, the retractable pencil features a precision tip that glides on effortlessly to mimic individual brow hairs and fill in even the tiniest of gaps for a professional-looking finish. Waterproof and smudge-proof, the matte formula delivers natural, hair-like colour to create enviable, well-shaped arches that last.