Staedtler's permanent black ink pen flow evenly for arts, crafts, sketching and drawing. They are archival quality, fade-resistant and acid-free with a long metal tip that is ideal for use with rulers and templates. These pens come in a cardboard box and available in multiple line widths.The ink is dry safe which means that the pen can be left uncapped for days without drying up (Test ISO 554). The pens are airplane safe and the automatic pressure equalisation prevents the pens from leaking on-board aircraft.