 (common sizes range from .9mm up to 1.1 or 1.5mm, though one can find others outside of this range) On fountain pens, the difference between a broad nib and a stub nib can get even murkier with all of the variations ranging from what's often called an Italic nib, which tends to have sharper corners like a traditional broad dip nib, to a Cursive Italic or some such variation with more rounded corners to facilitate smooth and continuous writing.A stub nib can be a good choice if one hopes to achieve modulation in line (thick and thin) you can get with a flexible nib, but if they also want the smoother and easier action of a monoline (non-flexible) nib.To write with a stub nib, just as you do with a broad nib, you try and hold it at a consistent angle to the line of writing.