These are terrible lids. I’ve canned with them several times now and every canter load has failures. The latest, I canned 14 jars and six failures out of those. Do not recommend.
These lids will not withstand being used in a pressure cooker or hot water bath. When used in a hot water bath they warped and buckled and did not seal. I have been canning for over 50 so I am not a novice.