Faber-Castell Pitt Artist pens are ideal for graphic artists, designers, illustrators, architects or colouring in enthusiasts! They offer all the advantages of drawing in Indian Ink in an easy disposable brush pen. The high quality brush nib provides maximum flexibility which allows for straight and bent stroke work without breaking. The pigmented, lightfast drawing ink is perfect for sketches, drawings, layouts, fashion design and illustration. Acid-free. When dry they are odourless and waterproof. Can be used on paper, wood, photographic film, plastics, paint, as well as other paintings.