The Staedtler Lumocolor permanent marker is a universal pen for use on overhead film and almost all surfaces. Superfine markers are suitable for use on CDs and DVDs. The ink is xylene and toluene-free and has the property of being dry safe. Dry safe means that the pen can be left uncapped for days without drying up (Test ISO 554). The ink has high smudge-proof and waterproof qualities on almost all surfaces. Black, orange and brown are light-fast and the black is also weatherproof. The colours offer good colour brilliancy. The ink is fast drying which means the pens are ideal for left-handed users. The polypropylene barrel and cap ensures a long service life for the pen. The pens are airplane-safe and the automatic pressure equalisation prevents the pens from leaking on board aircraft.