Staedtler Lumocolor 488 51 Whiteboard Marker Refill Station Green BTS2023 AC Derwent Chromaflow pencils have been choose the Versa series Derwent Chromaflow pencils have been formulated with rich pigments to deliver bold Apple HomekKit supported Refill station to fill ST351 & ST351 B Lumocolor® whiteboard markers Practical PP (polypropylene) refill stations for easy and clean refilling Simply insert marker and minutes later it is ready for use Marker is completely refilled after 3 4 hours Impossible to overfill as the marker can only draw its own maximum ink content out of the refill station Can refill up to 7 markers depending on the condition of the marker tip Green refill ink