The Kuretake Ai-Liner Ultra Fine Brush Pen is an ultra-fine brush pen that is inspired by the eyeliner used in cosmetics. The ultimately thin brush tip uses the same technique as the brush tip of an eyeliner, making this pen perfect in creating fine details in drawings or illustrations. This brush pen uses waterproof, pigment ink, and allows you to color it over with watercolor or other water-based pens or markers.

Synthetic bristle brush tip
Water-based pigment ink
Water-resistant