Rollerball pens are similar to ballpoint pens in that they both operate by a tiny ball distributing ink onto the paper, but the ink in a rollerball pen is water based, like you would get in a fountain pen. This means that a rollerball pen needs a cap, to stop the ink from drying out, and also it means that the writing style is much more fluid than a ballpoint, while being much easier to maintain than a fountain pen.
Rollerball pens are a half way compromise between the two, taking the ease of use of a ballpoint, and combining it with the elegant writing style of a fountain pen.
![Pilot V Fineliner Pen [SW-V-PP]](https://www.theonlinepencompany.com/cache/450/pilot/v-fineliner/199844.jpg)
![Pilot FriXion Clicker Gel Ink Rollerball Pen [BLRT-FR7]](https://www.theonlinepencompany.com/cache/450/pilot/frixion-clicker/466250.jpg)
![Pilot Greenball Rollerball Pen [BL-GRB7-BG]](https://www.theonlinepencompany.com/cache/450/pilot/greenball/345234.jpg)
![Pilot FriXion LX Erasable Rollerball Pen [BLLF-BK7]](https://www.theonlinepencompany.com/cache/450/pilot/frixion-lx/462788.jpg)
![Pilot P500 Gel Ink Rollerball Pen [BL-P50]](https://www.theonlinepencompany.com/cache/450/pilot/p500/182372.jpg)
