Perfect suitable for fine, detailed works and lines. Containing a acid-free pigment ink on alcohol base, made in Japan. Waterproof & photocopy safe. Certified with the AP-Mark quality seal, the high qualitative ink guarantees a true black color. The nib is made out of strong synthetic and will not break up or fringe. Compatible with all Montana Acrylic Markers and Colors. The Sketchliner Set includes the following sizes: 0.1mm, 0.2mm, 0.3mm, 0.5mm and 0.8mm.