The acid free, water based pigment ink in the Artline technical drawing pen is water resistant and fade proof | The metal ferrel is ideal for template and ruling work, making this range ideal for all general writing, drawing and technical drawing | Fibre nib with 0.8 mm line width | Metal reinforced nib is suitable for ruler and template work | Water based pigment ink which does not bleed through paper | Fadeproof, water and smudge resistant