Staedtler Lumocolor Non-Permanent Fine Assorted (Pack of 8) 316 WP8The Lumocolor non permanent pens guarantee professional and effective presentation on all overhead transparencies. For use on any glossy surface, the pens are supplied in a handy stand up desktop box and have a fine 0. 6mm tip. Universal pen for use on almost all surfaces Water soluble ink can be wiped from film with damp cloth Works on CDs, glass, plastic, metal, porcelain, wood, leather and OHP film Fast drying ink prevents smudges Fine 0. 6mm tip