Pigma is a highly rated, neutral pH archival ink, safe for use on paper, in scrapbooks, or for art projects. Pigma ink will not feather or smear once dry, is waterproof, chemical- proof, and fade-proof, and will not bleed through most papers. Sizes include .005, .010, .020, .030, .050, and .080. A full set of six black pens is features one of each thickness and is available separately. Colors available include black, blue, brown, green, orange, purple, rose, and red. Note: not all pens are offered in every thickness.