Warning! Major gripe! Do to my habit of shoving an unused lid into a new box, about 7 or 8 years ago, I found a lid that felt different. When I compared it to the new lids I found that on the older lid the metal was stronger and the sealant was more than twice as thick. I was angry and wrote Kerr/Ball about it. Of course no answer back. It's all about money...theirs! I've also noticed that most of the jars you buy food in are now odd sizes so a canning lid won't fit it. I used to use any jar a lid would fit on for pickles, jam, etc. The main grip I have is the boxes of new lids say 'used with-in one year'. I can to last at least a year and sometimes 2, if I have a crop failure. Thanks for allowing me to vent.