Rotring - Our rOtring Isograph is a high precision technical pen with refillable ink reservoir that comes in various line widths, making it the perfect pen for anyone with an idea💡 | Facebook
Inclusivist|rötring Isograph Technical Drawing Pen - Black Liquid Ink, 23ml
Needed a Pen that I could Drag Across a Ruler Without Marring Nibs. But I am Too in Love with Fountain Pen Inks to Use Just Any Pen. Solution: Rotring Isograph 1.0mm :
Rotring Isograph Pen 0.1-1.0mm Needle Point Drawing Ink Pen For Spencerian Writing
Amazon.com: Rotring Isograph Ink Black Short Cartridge - Box of 5 : Office Products
Wholesale Rotring ISOGRAPH Fineliner Pen, German Engineering Drawing Needle Pen, Multiple Nibs, Fillable Ink, Art Marker, 230818 From Long10, $26.2 | DHgate.Com
New Rotring Isograph Pen P - 0.18 mm - Made in Germany -for etching drawing inks | eBay