- 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