Sheaffer or Ferrari by Sheaffer fountain pens fit only Sheaffer ink cartridges or the corresponding Sheaffer ink converter.
If you decide to refill with ink cartridges, they are offered in packages of five cartridges per package and an assortment of colors. There is also an option to select the multi-pak, which has one of each different color in the package.
If you prefer to refill your Sheaffer or Ferrari fountain pen with an ink converter, those are offered below. Then choose a bottle or two if ink from our large selection. Colorado Pen ink arrives in a huge 90ml bottle. Pelikan offers standard ink or its premium Edelstein ink in nine vibrant colors. Waterman bottled ink is offered in all the favorite colors.