Refill cartridge for fiber markers. 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. This system ensures a smooth ink flow, and the flexible plastic tip allows you to choose individual line thicknesses. Thus, the fiber pen offers optimal writing quality and long-lasting performance. Innovative and proven writing instruments for everyday use. The company Pentel was founded in Japan in 1946 and initially focused on producing watercolor and oil paints as well as drawing pencils for kindergartens and schools. Numerous 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 and improved developments that make daily life easier, especially in writing, drawing, and painting.