The Sheaffer 50ml brown pen ink cartridge 94261 is a luxury ink bottle designed to refill fountain pens with a converter. Containing 50ml of ink formulated to provide a constant, lubricated flow that protects the feeder, it comes in a heavy glass bottle with a hermetic screw cap. The sophisticated earthy brown color lends a distinctive, warm, and very elegant handwriting. Indispensable for handwriting enthusiasts, diaries, and personal letters.