Pens that use rollerball refills usually are capped pens. Traditionally, this helped prevent the liquid rollerball ink from drying out, however recent advances in rollerball technology makes this less of an issue. The low viscosity of rollerball ink makes for a prominent line with an effortless flow of the point across the paper. Because these pens tend to be larger than the typical twist pen, there are more opportunities for elaborate designs. As you browse through, please keep in mind that I can craft any of these pen styles using any of the body materials you see. Also, many of these pens are also available as fountain pens.