NWB A cutting-edge liquid eyeliner that effortlessly creates a sharp, fluid, smudgeproof line in a single stroke that lasts 24 hours. This easy-to-use liner helps you achieve an intense black line that lasts for 24 hours. The combination of the brand's Easy Glide waterproof formula and the innovative dual-fiber brush creates an amazing eyeliner. How to use: Shake well. Lay brush against lash line and allow the flexible bristles to trace along it for the perfect tight line. Use the precision tip to flick up and out at the edge of the eye, if desired.