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A fountain pen is a pen that contains a reservoir of water-based liquid ink. The ink is drawn through a feed to the nib and then to the paper via a combination of gravity and capillary action, so most fountain pens require no pressure to write. Filling the reservoir with ink may involve replacing a disposable ink cartridge, filling the pen with an eyedropper, or operating an internal mechanism which sucks ink from a bottle through the nib into the reservoir. These mechanisms are typically pistons or rubber sacs. Pens that accept cartridges are often made to allow the option to suck ink into the pen through the nib by replacing the cartridge with a syringe-like device called a converter.