With the precision you've come to expect from German engineering, the Staedtler Lumocolor Correctable OHP Fine Point Pen delivers high-caliber performance you can depend on. This non-permanent dry-erase pen features lightfast, water-soluble ink and automatic pressure equalization technology that prevents leakage while flying. The Lumocolor Correctable OHP Pen is available in two line widths and is ideal for use with overhead projector films, the Lumocolor year planner (641 YP) and Lumocolor memo board (641MB).