• Staedtler Lumocolor Permanent Universal Blue Medium Line Pen for use on overhead projector film and almost all surfaces. • Produces a medium line 1.0mm width. • Dry Safe ink so pen can be left uncapped for days without drying up. • Features high smudge-proof and waterproof qualities. The ink of these Staedtler Lumocolor Permanent Universal Blue Medium Line Pen features high smudge-proof and waterproof qualities on almost all surfaces. It is for use on overhead projector film and almost all surfaces including CDs and DVDs. The Dry Safe ink means that the pen can be left uncapped for days without drying up. The ink is also fast drying which means the pen is ideal for left-handed users. A polypropylene barrel and cap ensures a long service life for the pen. This pen is airplane-safe and the automatic pressure equalisation prevents the ink from leaking on board an aircraft. Medium line width is approximately 1.0mm. Additional details: Packaging size: 140mm x 13mm x 11mm