What it is: A liquid eyeliner pen with the thinnest brush in the world and a formula that won’t smudge, fade, or come off in water. What it does: Blinc ultrathin liquid eyeliner pen boasts a brush of only 0.00876mm, making it the thinnest, most precise brush in the world. It glides on smoothly, providing an exact, vibrant line of color, and allowing you to create virtually any look you desire from a thin classic line to dramatic, winged looks. Blinc ultrathin liquid eyeliner pen is waterproof, smudge-proof, and fade-proof. When you are ready, it can easily be removed with gentle makeup remover.