edding BTK 25 refill ink whiteboard marker - black - 25 ml - Pack of 2-36Refill ink with capillary system, ideal for clean and straightforward refilling of almost all edding whiteboard markers. The refill bottle has a volume of 25 ml. Simply stand the marker nib downwards in the refill bottle for at least an hour, or ideally overnight and then the marker is ready to write again. Refilling reduces the amount of waste produced and extends the products' service life. Refill ink with capillary system ideal for quick refilling