Our G2 Refill adapter converts your pen to a rollerball by simply threading this into the section in place of a Jowo #6 nib unit. This adapter was designed to work in all of the Jowo#6 cartridge/converter pens made by Little Hollow Customs.
Compatible with any pen designed for a Jowo #6 nib unit and international size cartridge/converter,
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Very fun to have this capability now for rollerballs! Fits excellent!