Kerr, 12 Pack, Regular Canning Jar Cap. Our trusted Ball and Kerr Brands of Fresh Preserving Canning Lids have been crafted for quality for generations. When it comes to canning, there’s nothing more important than a quality seal. It ensures that no oxygen gets into the canning jar after processing and that your food will remain preserved just the way you created it. Our manufacturing facility in Muncie, Indiana produces each lid with pride. We use our custom, time-tested sealing compound so you get a quality seal. And we use an underside coating on each lid so that the natural acids in your food will not react with the lid. And our canning jars and lids have been made here in the U. S. for more than 125 years. So you can trust that each jar is every bit as genuine as the creation inside it.