permanent universal pen Design awarded universal pen for use on overhead film and almost all surfaces; S and M also suitable for use on CDs/DVDs DRY SAFE: The pen can be left uncapped for days without drying up (test ISO 554) Airplane-safe: An automatic pressure equalization prevents the pen from leaking on board aircraft Excellent smudge-proof and waterproof qualities on almost all surfaces Dries in seconds, therefore ideal for left-handed users Permanent, low-odour ink