Meet Maybelline NY's Build-A-Brow. The 2-in-1 brow pen + sealing gel that builds a fuller brow in just 2 easy steps. This easy eyebrow shaper builds real-looking, fuller brows that lasts up to 24 hour wear. In fact, brows look so real you can't even tell it's makeup This long-lasting brow pen sculpts and seals to perfect your brow look. This long-lasting brow pen is also sweat-resistant, smudge-resistant and humidity-proof. Say goodbye to sparse, thin and uneven looking brows forever when you use Build-A-Brow.