Permanent opaque waterproof and quick drying on most surfaces. The fiber 5.0 millimeter nib requires only a light touch when writing. Add detail to cards illuminate poems or letters use for labeling and more. Writes on paper, plastic, leather, glass, wood, rubber, porcelain, film, and metal. Low odor, xylene-free. Pen-Touch Metallic pens are acid-free and permanent, but not archival so the pigment may fade over time.