What it is: A waterproof, metallic liquid eyeliner in twist-up pen. What it does: Create an intense single stroke of color with a tinge of pearlescent sparkle. The easy-to-use, precision brush can be used to draw the perfect line for subtly accentuating the eye or for a dramatic, winged-out look. The versatile formula doesn’t flake, fade, or budge, making it ideal for use as an eye shadow, highlighter, or brushed onto lashes over mascara for a dip-dye effect.