STAEDTLER 313 9 Lumocolor Permanent Pen, Superfine Line Width, 0.4mm Black (Box of 10)

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 Superfine line width approximately 0.4 mm Box of 10, black