This piston-style converter works with your LAMY Safari, AL-Star, Joy, Vista, or Lx fountain pen and allows you to use any brand of bottled ink. Insert it into your pen just as you would a cartridge, being careful to align the converter's round peg with the round clip in the pen's feed section. When installed correctly, the Z28 should snap into place. Holds 0.8 mL of fountain pen ink. Made in Germany.