With most pens you can chose for a nib in F (Fine), M (Medium) or B (Broad)
For some pens there is a wider option as Extra Fine, Extra Broad, or Italic. These nibs are suitable if you like to use the pen for a special way of writing.
When used for 'day to day' writing a nib in F if you have a small handwriting, M for regular size handwriting or B for larger handwriting or signatures would be most suitable.
For the luxury pens, the nibs can be tested before shipping. It will be inspected on alignment and dipped in ink for test writing. Afterwards it will be properly cleaned before sending the pen to you.
If you'd prefer that I'll test the nib's performance before sending the pen, please just let me know when placing your order.