This set includes six Pigment Liners in assorted line widths: .05, 0.1, 0.2, 0.3, 0.5, 0.8. Staedtler fineliners for writing, sketching and drawing. The pigment ink is indelible (in accordance with ISO 14145-2), lightfast and waterproof on paper. They are erasable when used on drafting paper: no bleeding when highlighted. The long metal tip is ideal for use with rulers and templates.  Features: Can be left uncapped for at least 12 hours without drying up Aeroplane-safe: automatic pressure equalisation prevents pen from leaking on board aircraft