Although most commonly used for writing, ballpoint pens are great for quick sketches or for transferring a drawing. Most ballpoint pens are not permanent.
There is a terrific variety of permanent fine-line drawing pens. A .03 size is probably the best for drawings 11" × 14" (28cm × 36cm) or smaller. However, it is possible to create exciting drawings with bolder pens.
Technical pens come in three types:
Felt-tip pens come in various sizes and colors. Experiment to find the pen that works best for you.
Brush pens have a flexible, fibrous point. The pen can make lines of varied widths from fine to broad, like a round paintbrush.
Cleaning Technical Pens
Keeping your technical pens clean is extremely important. Follow the instructions that accompany the pen for specific cleaning techniques.