Looks like jar rubber seals are replaceable and not reused.
It would appear that if you’re careful opening the jar the rings are reusable.
I would imagine that having a few spares anyway would be prudent.
I thought when I first looked at the sight that the rubber seals would have to be replaced each time but checking around on the site I found that was not the case. They only need to be replaced if damaged although they recommend turning them over each time.
I think I’d try them on something like tomatoes which I go through rapidly just to see.
I do reuse some old lids for things going in the fridge or for storing seeds or dehydrated foods. I have so much time and effort into canning that I’m not a happy camper if I have something not seal, even less happy if something spoils. Probably because I love everything about my garden except the canning. That’s just a necessary evil :)