FeaturesPen for OHP film and other glossy surfacesMedium tip 1.0mmPermanent ink for lasting useDry-Safe ink for up to 2 days cap-off timeFast drying ink prevents smudgesThis premium Staedtler Lumocolour Permanent Medium Pen (Pack of 4) has been specially developed for use on overhead projection film for stylish presentations. This versatile pen is also suitable for use on a variety of other surfaces including glass, CDs, plastic, porcelain, wood and leather. The permanent ink is fast drying to avoid smudging and provides vibrant, high intensity colour. The medium 1.0mm tip is great for neat, legible writing, drawing, diagrams and more. This pack contains 4 assorted pens in Black, Blue, Green and Red.