On Saturday, my 13-year-old daughter and I spent a couple of hours sketching, which is one of our favorite activities. I was copying out of a book called Rendering in Pen and Ink, and Jane let me borrow her Micron pens. I loved using these pens. The ink is very dark and was perfect for practicing cross-hatching and the other techniques described in the book. They are inexpensive, too. A set of six Micron Pens, with line widths ranging from 0.20mm to 0.50mm, costs less than $(removed) on Amazon. I just bought a set for myself.