These sets feature a collection of Pigma pens for a variety of drawing and writing needs. Great for graphic design, cartoons, sketches, free-hand illustrations, calligraphy and tole craft or as a bold line pen for general writing, Pigma Graphic 1 Pens feature high-quality, quick-drying pigmented ink that is waterproof, fade resistant and will not smear or feather once dry. Fine-point Pigma Micron Pens have waterproof, quick drying pigmented ink for permanency and true color reproduction. They can be used for graphics, drafting, illustration, accounting and more. Developed to meet the needs of calligraphers, illustrators, Manga artists, cartoonists and crafters, Pigma Micron Brush Pens' versatile brush tips create fine lines to broad strokes. The ink is archival, quick drying, will not bleed through most fine paper and will not smear or feather once dry. The 10-pen Gray & Black Ink Set includes one each of Pigma Micron 01, 05 and 10 Pens in Light Cool Gray and in Cool Gray, one each of Pigma Micron 05 and 10 Black Pens, and one Pigma Brush Pen in Light Cool Gray and in Cool Gray. From Sakura.Details:Includes assorted shades of gray and blackAssorted nib sizesArchival ink is chemically stableHigh quality pens will not smudge or bleed through paperWaterproof inkFade-resistantMeets ASTM and ACMI non-toxicity standardsAP seal certified