Your fountain pen purchased from Creations By Daniel will typically include four parts when assembled—the cap, the nib, the barrel, and the ink reservoir. Most reservoirs are either a piston converter, AKA pump or  a cartridge or an ink bladder. The converter and ink bladder require fountain pen bottled ink. The cartridge is a self-contained, disposable unit filled with ink. Click here or see the links section on a detailed break down of fountain parts.