Bobbi Brown Perfectly Defined Gel Eyeliner is a unique gel-based pencil that delivers richly pigmented color and precision lining with sweat and humidity-resistant 12-hour wear. It has a twist-up design lets you apply on the go, while a built-in sharpener ensures the most precise application every time.Bobbi Brown Perfectly Defined Gel Eyeliner features super-saturated color that doesn"t flake and stays color true all day. Plus, its silky-soft and creamy texture gives it a lightweight, comfortable feel without tugging or pulling.