SAKURA-Koi: Coloring Brush Pens. These markers are perfect for graphic artists, illustrators, designers, architects, cartoonist, students, and hobbyists. The flexible brush tip allows you to achieve fine, medium, or bold brush strokes simply by changing the pressure on the nib. The water-based ink is transparent, blendable, and odorless. This package contains six Coloring Brush Pens. Conforms to ASTM D4236. Imported.