The Pilot OHP Permanent Marker Pen Wallet of 6 is a premium set of permanent markers specially designed for writing on overhead projector (OHP) transparencies, plastic, glass, metal, CDs, DVDs, and other non-porous surfaces. Featuring quick-drying, water-resistant permanent ink, these markers produce bold, smear-resistant writing with excellent clarity. Supplied in a convenient wallet of six assorted colours, they are ideal for presentations, office work, classrooms, laboratories, arts and crafts, and general marking applications.