FeaturesPen for OHP film and other glossy surfacesMedium tip 1.0mmWater-solubleDry-Safe ink for up to 2 days cap-off timeFast drying ink prevents smudges This premium Staedtler Lumocolour Non-Permanent Medium Pen (Pack of 10) has been specially developed for use on overhead projection film for high intensity, vibrantly coloured presentations. This versatile pen is also suitable for use on a variety of other surfaces including glass, CDs, plastic, porcelain, wood and leather. The water-soluble ink is fast drying to avoid smudging but can be easily wiped from the film after use using a damp cloth. The medium 1.0mm tip is great for neat, legible writing, drawing, diagrams and more. This pack contains 10 black pens.