This package of six Black Mono Drawing Pens is from Tombow. These pens are made with water-based pigment ink which produces smooth, skip-free drawing and writing with no smudges. This ink dries instantly. These pens have durable nibs which withstand firm pressure without bending the tips which ensure a steady ink flow. These pens can be used with drawing, marker, watercolor, and mixed media papers. These pens are also ideal for illustrations, manga, anime, technical drawings, lettering, and journaling. These pens have six tip sizes: 01, 02, 03, 04, 05, and 08. The ink is odorless. These pens have black ink and the pens are not refillable.