Here is some info on the plotter pens.

These should fit into  a Roland plotter.

Staedtler 75PL3CS Mars Plot Tungsten Carbide 0.35mm dia. cross groove
pen.

Staedtler 75PL07H2PC plotter adapter

Staedtler 48523SAR-9 solvent based ink.

Regards

Tony


Just when I thought I knew it all,
I learned that I didn't.