This Pilot CON-40 Converter is a piston converter that includes several small metal agitator balls that help to maintain consistent ink flow from the converter to your nib and feed. The CON-40 converter will replace both the Pilot CON-20 and the CON-50 converter. The Pilot CON-40 converter fits in all current Pilot and Namiki pens, including the Vanishing Point and the E95S.