Others Others L'Oreal Paris Ultra-precise liquid eyeliner Perf Slim Discover the new Perfect Slim liquid eyeliner, with an extra-fine 0.4 mm tip for ultra-precise lines. What's more, its intense gray-finish formula is water-resistant, scratch-resistant and 24-hour wear-resistant. Get a stunning look all day long. This gray eyeliner is quick and easy to apply in a single stroke. Thanks to the high-precision tip, it traces a precise, intense and modulable line for a unique look.