When accuracy, minute details and preservation count. The Pigma Micron ink pen is selected for fine-point technical and artistic applications requiring top quality capabilities. A formulation of pigment based inks, more complex and stable than dye based inks, reliable, permanent, archival quality ink. Experience smooth, skip-free writing and crisp ink colors that leave consistent lettering and lines every time. Ideal for decorative fabric artists.The Pigma® Micron ink pens feature:archival quality ink for use in acid-free environments chemically stable, waterproof,and fade resistant, no smears, feathers, or bleed-through on most papers, meets ASTM and ACMI non-toxicity standards. *For best results use on 100% cotton fabric not intended to be washed