Doesn't Fit Bologna Burkina from 2005,
Good company selling these here, but a bit of confusion since the part number appearing on this item is shared between Kendro and sellers, but is not the part number the customer sees on the side of the pen refills.
If you have the Bologna Burkina, note that neither the pre-2005 ("Old") or 2005 and later ("New") Bologna rollerball refill will fit it.
For the Bologna Burkina you need the "short capless rollerball refill" for the Arte Italiana, part number P8126, (there's no mention of "Bologna" at all for this refill on Kendro's refills page, just Arte Italiana, but it's the correct one for the Bologna Burkina from 2005 nevertheless).
Better still, do a search on Amazon for "Schmidt P8126" and buy that instead, since it's the EXACT SAME REFILL from Kendro (Omas' and Schmidt's parent company), just labeled for Schmidt instead of Omas, and costs ONE-THIRD the price (yes, you can buy three for the price of one).
I tried the "Old" Bologna refill, the "New" Bologna refill, and nothing worked. Then a dealer at a pen store showed me what's what and suggested I buy the Schmidt P8126 refills (three for the price of one labeled Bologna). I tried it (since my Bologna refill also sported P8126 labeled Omas) and he was right. The Schmidt refill was visually the exact same thing, worked great, and cost 1/3rd the price as the refill number P8126 but labeled "Omas."