I’d been after the Muji Fountain Pen for some time. I like the Muji aesthetic: simple, stylish, functional, unbranded. This fountain pen is very much in this vein.
It’s a simple aluminium tube with a nib at one end. The nib is scratchy and uninspiring. It’s a standard ‘iridium point’ nib, about a German fine in width. I don’t think they’re available in any other sizes.
The barrel is so light that it feels like it would buckle if you held it too tightly. I haven’t tested this out. If you put the pen down on your desk and a butterfly flaps its wings on the other side of the world, it will roll away.
The knurling is uncomfortable. (When people see knurling they tend to think: that must be jolly uncomfortable. When it’s done well, it isn’t at all. This isn’t done well.)
The cap closes and posts in a very clever way, by sliding inside the barrel. It’s neat. It means the metal at the end of the cap is incredibly thin and I can’t see it lasting very long before bending a little, making it impossible to put the cap on.
The pen takes standard international cartridges and some (but not all) converters will fit.
So, all in all, this is a pen that looks nice but is far too light and flimsy, uncomfortable to hold and has a poor nib. Spend your money on something else.