Staedtler Lumocolor Non-Permanent Fine Point Markers, 0.6mm F, Assorted, 4 Count (STD316WP4A6) Nonpermanent marker is designed for overhead projection writing Quick-drying, water-based, nonpermanent ink won't bead or smudge Write on overhead transparency film or such glossy surfaces as photos, transparency sleeves, slide frames, cromalins, glass, acrylic and vinyl 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 pen features a polypropylene barrel and cap with a clip to attach to notebooks, pockets and more