This Pentel water-based pen has a tip that makes it easy to vary the line. It feels like something between a brush pen and a felt-tip sign pen. Press lightly for a thin line and press harder for a thick one. The ink is a water-based dye. Only the fluorescent colors use water-based fluorescent pigment.
The range has 36 colors, including 6 fluorescent colors. There are three 6-color sets (A, B and C), a 6-color Neon Color Edition set and a 24-color set. Each color is also sold on its own.
It works for filling in small areas. Touch a light-colored tip to a darker pen before drawing to make a gradient. With a water brush (a brush that holds water in its barrel), you can also blur and spread the colors.