Ideal for overhead projectors, transparencies, and all other types of films, acetates, and laminated calendars. Won't fade or bubble under intense lamp heat. Specially formulated ink provides clear, bright images. Durable, fine point tip for thin, detailed lines. Erases with a damp cloth or tissue. Expo Vis-A-Vis Wet-Erase Overhead Transparency Markers, Fine Point, 4-Pack Pouch, Assorted Colors.