Dark writing board marker that can be seen clearly, even from a distance. Medium point [Features] This board marker has a dark brush marker, so you can see clearly even from a distance. It allows you to continue writing steady from start to start using it until the ink runs out, so you can always write dark and crisp, without leaving any marks on the way. Ideal for whiteboard/electronic board (OA board). You can see how much ink is left. Cartridge type so ink can be refilled. Medium round core.