The Pilot "Board Master" has a deep brush mark that allows you to see clearly even from a distance, and adopts a newly developed TPF system for stable ink control on the nib. Even if you continue to write on the board board, you can always write dark and crisp, without the risk of falling. Great for whiteboards, as well as electronic boards (OA boards). STABLE WRITING CONTENTION TPF system ink supply control ensures that the paint stays intense, consistent and consistently from start to run out of ink cartridges. The ink and nib are replaceable, making it very economical. Cartridge type makes refilling easy When replacing cartridges, be sure to turn the tip upwards with the cap on. We do not offer extra thick replacement chips.