Estee Lauder Double Wear Gel Eyeliner Pen in the shade "Onyx" is a long-lasting, water-resistant gel eyeliner pen that delivers intense color and precise application. The formula is designed to stay put for up to 12 hours without smudging, fading, or transferring. The pen is also designed with a fine tip to create thin or thick lines, and it's easy to control for precision application. "Onyx" is a deep black shade that is perfect for creating bold, dramatic eye looks. It's a popular choice among beauty enthusiasts who want a reliable and long-lasting eyeliner for all-day wear.