- Excellent smudge-proof and waterproof qualities on almost all surfaces - Dries in seconds, therefore ideal for left-handed users - Colour-intensive, low-odour - Lightfast (black and green for over 10 years on paper) - Black and green are weatherproof - Locked tip - Stand-up STAEDTLER box - PP barrel and cap guarantee long service life - DRY SAFE – can be left uncapped for days without drying up (Standard atmosphere according to ISO 554) - Airplane-safe - automatic pressure equalization prevents pen from leaking on board aircraft - Xylene and toluene-free ink - Refillable