Steel Ball Eyeliner: Blue Heaven sketch Eyeliner has a unique steel ball feature that resists drying and maintains the liquid ink's freshness, guaranteeing seamless flow with each usage. Waterproof & Smudge Proof Formula: This eye liner is designed for long lasting wear, this eyeliner waterproof and smudge proof, making it perfect for hot and humid climates or long days without touch-ups. Precise Application: The fine tip of the sketch eyeliner pen allows for precise and controlled application, making it easy to create sharp lines, cat eye wings, or dramatic bold looks. Rich Matte Black Finish: This Blue Heaven eyeliner delivers a rich, intense matte black finish that lasts all day without fading, giving your eyes a defined, bold look from morning till night. Easy to Use: This pen eyeliner glide on smoothly with a comfortable grip, perfect for beginners and pros alike.