Staedtler Felt pen

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