SAKURA-Pigma Pen Set. This pen set is ideal for all kinds of sketching; inking; and illustrating projects. The archival quality ink is waterproof; chemical resistant; fade resistant; bleed free; quick drying; and pH neutral. There are eight pens each with a different tip size or style (.2mm; .25mm; .3mm; .35mm; .45mm; .5mm; brush; and graphic); all have black ink. This package contains one set of eight pens. Acid free. Conforms to ASTM D-4236. Imported.