Pigment Liner pens are ideal for illustration, graphic and technical drawings, sketching, crafting and lettering. The durable nibs produce fine lines making them great for detail work. The pens contain acid-free, archival-quality water-based pigment ink that is water- and fade-resistant when dry. The 3-pen set includes a variety of nib sizes in black. The 6-pen sets include either all pigment liners or a variety of liners and a brush tip pen in black. The 12-color set includes one .5 pen each of black, blue, brown, gray, green, light blue, light green, orange, pink, purple, red and yellow.