The Uni Pin Drawing Pen is a fineliner for artists and designers available in sizes from 0.05mm to 0.8mm. These pens are particularly useful for artists who wish to add watercolour washes to their sketches and technical drawings, as the ink is waterproof once dry. Because these pens use a lightfast black ink, artworks created with them will not deteriorate under normal display conditions. This is a 0.6mm fine-liner.