Our double-headed eyeliner liquid pen is carefully formulated with acrylic (ester) copolymers and propylene glycol. Designed specifically for outlining perfect eyeliner in one stroke and easily creating exquisite and versatile eye makeup effects. The usage method is extremely convenient: 1. Gently shake the eyeliner liquid pen to evenly mix the liquid components inside. 2. Steadily drag the pen tip of this product along the base of the eyelashes towards the outer corner of the eye. You can gently stroke in sections and then connect them to form smooth lines. The outer corner of the eye can be appropriately elongated and raised according to your preference. 3. Just achieve the desired effect. Moreover it is a quick-drying formula that quickly sets and presents a semi-matte texture. It is waterproof sweat-proof and does not smudge for a long time maintaining a long-lasting and delicate eyeliner without makeup smudge. The high-color liquid pen tip has a high saturation and it does not form lumps when applied in one stroke making it easy to draw smooth lines. Even beginners can create professional-level eyeliner.