Water base pigment ink. 
Non-toxic, fade resistant, waterproof once dry. The paint will not bleed through paper, unlike alcohol-based markers. Made in Japan.

Efficient: It can quickly cover large areas.

Precise: Its chisel tip enables controlled and refined lines.

Convenient: Unlike a conventional broad-nibbed felt pen, the tip can be removed and washed if it becomes stained or dries out.

Economical: For even longer marker life, the tip can also be replaced with a new one.

 The Uni Posca PC-8K marker has a broad 8mm chisel tip nib.