A fountain pen nib is one of the most crucial aspects of a fountain pen. Not only does it affect the look of a pen, but it also changes the individuality and personality of a pen. A nib is what makes contact with the paper and acts to allow the flow of ink to go from the pen to the paper your writing on.
The reason the nib can change the characteristic of a pen is because of the fact that a nib tip comes in different sizes. Common sizes, nibs are found is usually extra fine(EF), fine(F), medium(M), and broad(B) some additional sizes include stub(S), italic(I), music(M), and zoom(z) a nib tip size can greatly change the feel of writing with a pen, for example a wider nib has more ink making for a smoother writing experience.
While a narrower nib lets down less ink so writing requires a little more effort.Nib size depends entirely on personal writing preference.