Ideal for drawing, illustration, drafting, or general use, Uni Pin Fine Liners are artist-quality pens that can be used and enjoyed by professionals and non-professionals alike.These pigment ink-based pens provide intensity, depth, and water-resistance without bleedthrough. The quick-drying ink means smudge-free erasing while inking over drawings. They can also be used with watercolor work, as the ink will not smudge when wet.Uni Pin Fine Liners have nibs that are supported and protected by steel collars, extending the life of the pen and preventing damage from use with stencils. A clear window in the barrel allows users to see how much ink is left.