The Helix Fine Line Markers were designed primarily for draftsmen and artists. They are also good for picky writers who want a consistent, quality line.

They come in the basic colors: black, blue, red and green, and are available in .1mm, .3mm, .5mm, and .8mm widths. All use pigment ink that is water based, water resistant, and according to Helix, fade proof.

These are quite comparable to the Staedtler Pigment Liner pens.