Cartridges are pre-filled, disposable ink units that snap directly into the pen. They’re the easiest option. No mess, no maintenance: just replace and keep writing.

Converters are refillable units that fit where a cartridge would go. They let you use bottled ink while keeping the convenience of a cartridge-style system.

Piston fillers have a built‑in filling mechanism inside the pen body. They draw ink directly into the barrel, offering the largest ink capacity and a traditional fountain pen experience.