Fill your fountain pens with fountain pen inks using fountain pen ink converters. Lamy  Z28 Converter (previously called z24 converter) is designed to fit in your Lamy fountain pen in place of a Lamy cartridge, and can convert your fountain pen to fill from an ink bottle. This will fit the Lamy Safari, Al-Star, Joy, Vista, Lx, and Nexx series of fountain pens.