Black ballpoint on 9x12" Strathmore paper. I feel comfortable using ballpoint unless they bleed occassionally. The fineness and consistency is what I look for a good ballpoint. It's as versatile as a pencil, I could get darkness or lightness out of it depending how much pressure I put on my drawing. There is only one downside, which is bigtime if one is not careful, and that is, everything you put down on paper is final, no erasures. It's easy if you're used to looking at your artwork as a whole in the first stage before you go on the detail, as it should be with any medium. That way, one is commited to not making many significant mistakes.