Once you use this, you won't ever want another jar tool

The reason it's hard to open jar lids is because the vacuum seal is pulling the lid tightly against the jar. Once in awhile, the vacuum seal is so strong that I can't open it. That's when I grab my Jarkey, a $3 plastic lever that effortlessly breaks the seal, making it easy to open. I always try to open jars with my bare hands, then use the Jarkey as a backup. My wife goes straight for the Jarkey, because she's smarter than I am.