<--(Munkanapokon | 10-16)
New extra-fine POSCA PC-1M writes approx 1mm line - the sharp bullet tip can create a range of line widths depending on the angle used. Opaque water-based pigment ink writes on any surface and won't bleed through paper.
POSCA works on most surfaces and is permanent on absorbent media such as paper and card, and can be removed from shiny surfaces with a scraper. To make permanent: