Product Code :ST33222 Manufacturer Code : 317-9. Staedtler Lumocolor Medium Tip Permanent OHP Pen Black Pk10 317-9.This premium Staedtler Lumocolor pen 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 10 black pens.