Markfel Ltd is a specialist marker pen manufacturer, based in the UK. We manufacture a new and unique type of patented cartridge marker pen, which solves all of the existing problems of other marker pens. The main advantages of our system are: The refill cartridge takes a second to change, so there is no time wasted. The free-flow ink in the cartridge will not dry up like the other felt systems. The push-button system ensures the ink reaches the nib.