I searched "ISO drafting pens" and had several results, although none from the US or Canada. Wikipedia lists some manufacturers, and here are some online shops

I searched "ISO drafting pens" and had several results, although none from the US or Canada. Wikipedia lists some manufacturers, and here are some online shops from my first couple of pages of results. I've never used the steel nibbed pens. My grandfather was a draughtsman, and had a complete set, but as I understood it (age 10-ish) they were delicate and needed to be used carefully. I wouldn't buy a complete set on a whim :-) https://en.wikipedia.org/wiki/Technical_pen https://en.wikipedia.org/wiki/Technical_pen https://www.rotring.com/pens-pencils/technical-pens/isograph-drawing-pen/SAP_1903395.html https://www.rotring.com/pens-pencils/technical-pens/isograph... https://www.staedtler.com/intl/en/products/technical-drawing-instruments/technical-pens-drawing-ink/ https://www.staedtler.com/intl/en/products/technical-drawing... https://draftex.com.au/collection/pens-markers-inks/technical-drafting-pens https://draftex.com.au/collection/pens-markers-inks/technica... https://www.faber-castell.eu/products/TechnicalDrawingPenTG1S10mm/160001 https://www.faber-castell.eu/products/TechnicalDrawingPenTG1... (There were also Indian websites, so I'll bet there's China/Aliexpress too.)