It came with a prefilled. But I've got Diamine Oxblood, Diamine Sherwood Green, and Organic's Studios N to choose from for when the prefilled runs out.
If you're anything like me you can't figure out converters, lol. I've found that a syringe works GREAT to fill regular old Lamy cartridges. Went through nearly 100ml in the same cartridge this way. No inky fingers from converters.
In case you do try, I find it easiest to fill with the cartridge outside of the pen (carefully!) + then insert. It's a lot less messy than it sounds lol.
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Hope you enjoy your pen!