Rollerball Pens provide the glide of well-tuned fountain pens but the ease of cartridge refills. Rollerball ink is less viscous than the ink in ballpoint click pens or ballpoint twist pens. This means the ink in rollerball pens evaporates more easily. It's best to keep your rollerball pen capped when not in use. Choose from acrylic resins, wood, stabilized burl, and antler.