Staedtler Lumocolor 318-3 Permanent OHP Pen Blue 0.6mm Pack of 10

Euroffice

Pen for overhead projector film and other glossy surfaces. Permanent ink for lasting use. Dry-Safe ink for up to 2 days cap-off time. Fast drying ink prevents smudges. Works on CDs, glass, plastic, metal, porcelain, wood, leather and OHP film.

Amazon Marketplace

Universal pen for use on overhead film and almost all surfaces Dry safe - can be left uncapped for days without drying up (ISO test 554) Good smudge-proof and waterproof qualities on almost all surfaces Fine line width approximately 0.6 mm

Amazon

Staedtler Lumocolor Fine Tip Permanent OHP Blue Pen [Pack of 10]