What it is: An easy-to-use, 24 hour, ultra-black, waterproof, and smudge-proof felt-tip liquid eyeliner for classic lines and graphic looks. What Else You Need to Know: This non-stop ink flow and a flexible felt-tip liquid eyeliner provides the ultimate ease and versatility, from classic lines to graphic looks. It is designed for extreme wear, it is water-, smudge-, and sweat-proof, while also safe for sensitive eyes and contact lens wearers.