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 aeroplane-safe and the automatic pressure equalisation prevents the pens from leaking on board aircraft.Assorted packs of pens come supplied in the practical stand-up Staedtler box.With the Staedtler box you simply open, stand it up and start writing.The Staedtler box is so practical and just as ecologically efficient: Without the need for additional external packaging, it serves as a practical storage box and clever pen holder at the same time.Lumocolor permanent markers are available in a range of eight colours (yellow, red, blue, orange, green, purple, brown and black) and in a selection of four line widths (superfine, fine, medium and broad).The 317-9 pack contains ten black colour markers in medium line width.Medium line width is approximately 1.0 mm.