This cartridge-type roller ball liquid ink pen refills with with international short Kaweco ink cartridges, just like a fountain pen! It's a convenient ink system that gives you the smooth flow and color range of fountain pens in a roller ball pen form. The Kaweco Classic Sport Rollerball pen is available in different body colors and is made from strong yet lightweight ABS/Terlux plastic.
Pen dimensions: Approximately 10.5 cm long closed, 13 cm with cap posted x 10.8 mm body diameter. Cap diameter: Approximately 14.2 mm.
The video below shows how to install an ink cartridge in your Kaweco pen: