Refill ink for the yellow Staedtler Textsurfer Classic Highlighter Pen.
Simply insert your highlighter into the refill station to rejuvenate the ink. After a few minutes, it will be ready for short term use. After 3-4 hours an empty highlighter will be completely refilled. The highlighter can only draw its own maximum ink content out of the refill station, so no need to worry about overflow!