Z 41 - Rollerball large-capacity refills. Large-capacity refill for all Parker rollerballs. With a metal tip. Water-based ink. Line width: M. Ink color: Blue. The Parker Pen Company was founded in 1888 in Janesville, Wisconsin, USA. It manufactures various writing instruments and is particularly known for its fountain pens and different inks. Numerous discoveries, innovations, and advancements in writing technology are attributed to both chemical ink research and the dedicated and skilled designers and craftsmen of the company. Parker fountain pens, ballpoint pens, and inks are now used worldwide. The name Parker stands for ergonomics, innovation, and above all, the high quality of its writing instruments.