• This is a high-precision technical pen with a refillable ink cartridge. Available in various line widths. • The durable, hard chrome-plated thin edge allows for excellent detail. The nib is made of stainless steel. • The difference between rapidographs and isographs is in the way of filling. While the rapidographs have single use cartridges, the isographs have a refillable one.
Rotring (rOtring) is a former German manufacturing company of technical drawing tools and writing implements established in 1928 as a fountain pen manufacturer.
The name "Rotring" directly translates to "red ring" which is still placed around the barrel of their pens today.