Our waterproof eyeliner (chocolate color) is carefully formulated with triethanolamine and propylene. Designed specifically for easily drawing smooth eyeliner with clear contours and less prone to smudging. The usage method is extremely convenient: Sharpen the pen tip before use to ensure it is sharp enough. Gently draw delicate lines along the contour around the eyes. And it has a long-lasting color-locking formula, is sweat-proof and oil-proof, and is not easy to come off makeup.