rOtring 1903399 Isograph Drafting Pen, 0.01 inch (0.3 mm), Genuine Imported

Stable ink flow, high line quality, high speed line drawing No need to disassemble the nib, simply remove the push-on cover and clean it with water. The cap is double airtight with an airtight seal to prevent ink from drying up. Uses isographic ink with high concentration of fine particulate pigments that are highly water resistant and archival quality. (From Amazon.co.jp)

• ROtring was born in 1928 in Germany at a time when the art and architecture was reflected deeply in Bauhaus Design School in Germany. Based on the belief that "precise lines are beautiful" and the philosophy of "art in the industry" by Bauhouses, we have worked a number of products that are minimalistic, yet high performance. The process of creating ideas that creators and engineers have gone through the same time as the times change. And when inspiration comes out, you can visualize your shipment and expand your imagination infinitely rOtring follows this process and continues to support the creation of professionals
• The isograph drafting pen provides precise lines with stable ink flow that won't fray at high speed lines
• No need to disassemble the nib, simply remove the push-on cover and wash it with water for easy care
• Double air tight with built in air tight seal prevents dry-up. Uses fine pigment ink with excellent water resistance and archival quality
• 0.1 0.13 0.18 0.2 0.25 0.3 0.35 0.4 0.5 0.6 0.7 0.8mm Drawing Pen