Nonpermanent universal pens are designed for overhead projection writing. Deliver fast drying, brilliant color ink that resists fading and won't burn out. Also write on all smooth surfaces like paper, film, glass or plastic. Water-soluble ink can be wiped off film using a damp cloth. Great for crafts, graphic arts, photography, lab work or print shop. Fiber-tip pens feature polypropylene barrels and caps with clips.