I am using all three sizes of Fountain Pen Revolution's flex nibs in three pens available on their website. The green pen is a Guider Ebonite with a size 5 nib. The red pen is a Triveni with a 5.5 sized nib. The brown pen is a Guider Large Ebonite with a size 6 nib. The nice thing about the Guider pens is they have an ENORMOUS feed channel like you would find on a vintage pen and they keep up with the flex nibs with no problem. I did have to modify the cap of the brown pen to accommodate the number 6 nib, just a heads up if you want to try it out.

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