Water exposure, chemical contact, and years of light exposure without fading. Molotow builds these fineliners around permanent, quick-drying ink that stays opaque on the page, critical for work that demands lasting quality. Metal-encased tips maintain precision through heavy use, delivering exact lines from .05mm detail work to 1mm bold outlines.

The matte barrel provides secure grip during extended sessions, while cap-off protection prevents tip drying for 90 to 180 minutes when you pause mid-drawing. Set 1 covers fine detail with .05, .1, .2, and .4mm nibs, the range technical illustrators and architects reach for first. Set 2 handles bolder work with .3, .5, .7, and 1mm sizes, ideal for sketching, urban drawing, and expressive line variation. Both sets give you graduated line weights that work together, from precise underlayers to confident finished strokes. Archival quality matters when your drawings need to last decades or survive reproduction and scanning without degradation.