Refill cartridge for fiber tip pens. Replacement cartridge for the Tradio Stylo. Features a flexible plastic nib for customizable line thickness. Capillary system for consistent ink flow. Line thickness: 0.4 mm - 0.7 mm. Detail color: Blue. The Pentel Tradio Blue cartridge is a refillable design fountain pen equipped with a capillary system that ensures a smooth ink flow, while the flexible plastic tip allows for personalized line thickness. This fiber pen thus offers optimal writing quality and long-lasting performance. Innovative and proven writing instruments for everyday use. Pentel was founded in Japan in 1946, initially focusing on the production of watercolor and oil paints, as well as drawing pencils for kindergartens and schools. Many achievements in the world of writing and painting products are attributed to its own research and development laboratory. Examples include the first 0.9 mm fine lead for mechanical pencils, the first fiber pen "SignPen," the first rollerball pen "Ball Pentel," and the first correction fluid with a writing tip instead of a brush. For over 70 years, Pentel has been continuously working on new developments and improvements that make daily life easier, particularly in writing, drawing, and painting.