As for quality, it is good, just like all Bormioli jars, but I don't know what the problem is. Out of the twelve I bought, none sealed properly. As soon as I turned the jars upside down, the liquid inside came out all over the counter. And yes, I screwed them tight and no, it's not my first time canning. What can I say, for someone interested in canning, I wouldn't choose this design again.