I purchased these all separately (but as Kosta Bota) but one has a very smooth finished edge around bottom, while the other one has a more defined, sharper bottom edge. I have no idea why. Sharper bottom has the tiniest tiniest miniscual little bite. Price is reflective. One of the larger “bota’s is a tiny bit larger than the other. I had an idea of a collection. But like mybotger collections. I must purge