![Rotring Isograph Technical Drawing Pen,refillable Ink Reservoir, Available In 13 Different Line Widths,stainless Steel Nib - Gel Pens - AliExpress Rotring Isograph Technical Drawing Pen,refillable Ink Reservoir, Available In 13 Different Line Widths,stainless Steel Nib - Gel Pens - AliExpress](https://ae01.alicdn.com/kf/H785f7106ef8e43fa84bfd089396890cb1/Rotring-Isograph-Technical-Drawing-Pen-refillable-ink-reservoir-available-in-13-different-line-widths-stainless-steel.jpg)
Rotring Isograph Technical Drawing Pen,refillable Ink Reservoir, Available In 13 Different Line Widths,stainless Steel Nib - Gel Pens - AliExpress
![how to clean these old rotring ? , they are clogged on the inside and i have no idea how to clean them (one has fungus inside or smt) . : r/rOtring how to clean these old rotring ? , they are clogged on the inside and i have no idea how to clean them (one has fungus inside or smt) . : r/rOtring](https://preview.redd.it/how-to-clean-these-old-rotring-they-are-clogged-on-the-v0-82c19d6cqhx91.jpg?width=640&crop=smart&auto=webp&s=bc6cdad096c051233eeb609538be16f44a101199)
how to clean these old rotring ? , they are clogged on the inside and i have no idea how to clean them (one has fungus inside or smt) . : r/rOtring
![rOtring pen cleaning unit. Can fit 4 isograph nibs or variant style sections and 4 rapidograph nibs or other variant style nibs. Very usefull and safe for loosening dried up ink : r/rOtring rOtring pen cleaning unit. Can fit 4 isograph nibs or variant style sections and 4 rapidograph nibs or other variant style nibs. Very usefull and safe for loosening dried up ink : r/rOtring](https://i.redd.it/b4k2t8k25mc51.jpg)