Kaweco Euro Rollerball Refills, available in the shade of black and in writing thicknesses of 0.4 mm and 0.7 mm. Choose the writing thickness that best suits your writing style for a smooth and accurate writing experience. Fill your Kaweco rollerball pen with the reliable performance of Kaweco Euro Rollerball Refills. Choose your desired writing thickness and order now for an enhanced writing experience with accuracy and comfort.