This is a standard, piston style ink converter designed specifically for Sailor fountain pens. It features gold trim and a black knob. Attach the converter to the nib unit and place the nib point into any bottle of fountain pen ink. Twist the converter knob to expel any air, then twist the other way to suction ink inside. Wipe off the nib, reassemble the pen and you are ready to write. Converters give the freedom to use any brand or color of fountain pen ink. Compatible with most Sailor pens, excluding Realo or Chalana pens.