Effortlessly create any eyeliner look with Benefit They're Real Xtreme Precision Waterproof Liquid Extra Black Eye Liner. Its custom 0.1mm tapered brush tip and blend of ultra-fine bristles give you complete control for precise lines. With its waterproof, smudge-proof and flake-free formula, you can achieve a weightless satin finish that lasts for up to 24 hours. Perfect for a professional and polished look.