Feature refills with permanent, acid-free ink and flexible sketching and drawing long, flexible brush tip. These pens may be used in the studio or when traveling. They may be used as a standard writing pen for Chinese calligraphy and are the preferred sketch pen of artists throughout the world due to their rick ink and large brush shape. Although they are fun to use, they are also very serious art supplies that are capable of dramatic results on all sorts of drawing papers and boards. This basic pen features a plastic wood grain barrel, sepia ink, and a plastic cap.