well the regular mason jar O ring lids do provide a hermetic seal, that's why they're only supposed to be useable once though. The weird textured ring around the inside of the lid is some kind of gum substance that melts while canning and forms a seal. But I don't need no fancy sealin' for quick pickles, got dang it! And I'm too lazy to hand wash lids so I guess this is on me for running them through the dish washer knowing they could rust