Perfect for art, craft, sketching and drawing applications.The permanent pigmented ink allows greater opacity and withstands watercolor washes. The ink is quick drying, smear free and long lasting. It"s also acid-free, so it won"t fade over time.Metal-clad tip assures precise lines against tool edges. Ideal for many surfaces including wood, ceramic and photographs. The 4-pack includes assorted line widths of 0.1 mm, 0.3 mm, 0.5 mm and 0.7 mm.