Staedtler Lumocolour Overhead Projector Pen. Lumocolour guarantees professional and effective presentation on all overhead transparencies. Suitable for use on most other glossy surfaces. Fine Point. Permanent. Colour - Green. 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) Excellent smudge-proof and waterproof qualities on almost all surfaces Supplied in handy stand-up desktop box Fine line width approximately 0.6mm