The flexible fibre tip of this pen makes it perfect for more expressive mark making as well as accurate detail. This flexibility enables free flowing marks of various thickness to be achieved with just one pen. Using the same India ink as the rest of the Faber-Castell Pitt range means that marks are waterproof when dry with a high density of pigmentation. This ink does not bleed when used on suitable paper providing assurance and precision. Ideal for sketches, drawings, layouts, fashion design and illustration.