A convenient, portable alternative to traditional brushes and refill cartridges, Pentel’s Color Brush Pens are filled with brightly colored, water-based, liquid dye ink that dries quickly. They feature a flexible nylon tip that produces a variety of lines, from fine detail to broad sweeping strokes. Ideal for stylized design work, oriental artwork, calligraphy, cartoons and for creating translucent watercolor effects. Pens are valve-activated for a smooth flow without leaking.