This Uni POSCA PC-3M Poster Marker has water-based pigments which can be blended when wet or overlaid when dry. The have a medium, 1.3 mm tip which lets you draw lines that can be read from a distance. The ink produces opaque results that won't fade over time.
This marker has a 1.3 mm nib.
You can blend these markers when they are wet or overlay them when they are dry.
The pigment ink is fade proof and opaque.
The pens have a round, easy to grip barrel.
This marker has white ink.