All the refills below will fit Trobee handcrafted rollerball pens. They will fit 98% of all rollerball pens. If you have a handmade pen by ANY maker these refills should fit your rollerball pen.
All the rollerball refills you see were made in Germany by The Schmidt company. They are known around the world for having the best ink refills for rollerballs (and virtually any other pen). They do cost a little more than lower quality brands but you get what you pay for here. They write extremely smooth and offer you the best writing experience.