"Because they are generally wet-writing pens that write with a relatively wide line width (around 1.0mm I would guess, although there are slight variations among the different varieties), I use them primarily as craft pens rather than writing pens - and they are also marketed primarily as craft pens, i.e., pens that you can use for doodling, scrapbooking, mixed-media art journaling, and other art an" . . . .