Edding 142 M OHP permanent marker pen with a bullet tip for writing on transparent plastic film, for example when using overhead projectors. Can also be used for writing on glass, plastic, slideshows etc. Permanent, waterproof, light-resistant, low-odour, alcohol-based drawing ink. Smudge-free, quick-drying, can be erased using white spirit, highly transparent. Ideal for a clear and well-defined projection image.