Feature refills with permanent, acid-free Sepia or Black 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 Deluxe Pen set features a black metal barrel and matching cap with pocket clip, and includes 3 black and 3 sepia refills.