I have two Moonman M2 eyedropper fountain pens. They come with Fine or Extra Fine Moonman #5 size nibs. You can get other, more interesting nibs from Bobby Pens eBay store (office_supplies_pen). I had already swapped of the standard nibs for a medium and the other for a 0.7mm stub. I have just received a 1.1 stub from Bobby.

I do a writing sample of the medium and the 0.7mm stub first and then swap in the 1.1 stub so I have one 0.7mm and one 1.1mm stub Moonman M2.

Replacing these nibs is very easy because they come in a nib/feed assembly that just screws into the section. They are very inexpensive as well ($3.98US). They are now two very interesting pens with a couple of beautiful colours; Iroshizuku Yama Budo and J. Herbin Emerald of Chivor.

Bobby has these nib units available in TEN different varieties:
EF, F, M, 0.7, 1.1, 1.5, 1.9, 2.5, 2.9, F Hard.

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Considering that these Moonman M2 pens are relatively inexpensive at $11.00US and have 10 different nib choices for $3.98US each and have huge ink capacities (2.5-3ml), these are excellent choices for those wishing to experiment with various nib sizes and ink combinations.

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