Fineliner for writing, sketching and drawing Cap off: can be left uncapped for 18 hours without drying up (Test ISO 554) Airplane-safe: automatic pressure equalisation prevents pen leakage while on board aircraft Long metal tip, ideal for use with rulers and templates (e.g. STAEDTLER Mars lettering guide 572 FL) Lightfast and waterproof ink Pigment ink, indelible (in accordance with ISO 14145-2) Erasable when used on drawing film, no bleeding when highlighted With metal clip PP barrel guarantees long service life 9 line widths available in black ink