What it is: A precision liquid eyeliner. What it does: This eyeliner lets you draw waterproof liquid lines so sharp they could cut glass. Urban Decay's slender brush lays down long-lasting matte, slick, and shimmery shades sure to satisfy your color lust. Available in a veritable rainbow of long-lasting, highly-pigmented color options, these shades can be applied in thick or thin strokes with an ultra-fine brush tip that's short and easy enough to control. The slim pens are conveniently color-matched to each shade.