Features: Stylish appearance, simple and easy to use. Just the right feel comfortable, writing smooth. Double headed pen is more convenient for you to use. Using PP material as pen shell, has great airtightness and durability. Watersoluble dye inks is odorless, non-toxic and environmental-friendly. The color will dissolve in the water; you can mix the colors as you like. Pen point has compact fiber and great air permeability, which ensures the ink permeate smoothly. Suitable for effect rendering, art design, and cartoon design.