Yeah they work. But you would be happier getting a $30 or so pressure cooker. A dozen 1 pint or 1/2 pint jars. A coupla pounds of popcorn. And a coupla sterilite (or knock off) tote boxes. And then saving your money. Just google "popcorn tek". The midwest supplies jars work. But they are just as slow as any other pf cake jars. The midwest ones just have a few more additives. Don't waste the $ if you don't have to.