Identipen Fabric Pens are dual point pens with a tough fiberfine point on one end and an extra fine tip for details on the other. Withstands the roughest of treatment yet can provide the most delicate touch on silk. The ink is really permanent not only on fabrics, but on metal, glass, plastic, leather, wood, photos, ceramics, and more. It spread less on silk in our tests than other pens. Has a slight odor.