Product Code :ST33192 Manufacturer Code : 315-9. Staedtler Lumocolor Medium Tip Water Soluble OHP Pen Black Pk10 315-9.This premium Staedtler Lumocolor pen 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 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.