Ink Cartridges and Pen Refills
All of these cartridges will fit into all of our cartridge pens. The "half size" universal 38mm cartridges are recommended by most manufacturers - you put one into the nib section of the pen to give ink flow and another upside down inside the barrel to keep it in place and be there as a replacement if you run out of ink. The Stabilo refills are for Stabilo pens only.
Steve Lawson