These cushioned pads give you extra traction for opening stuck jar lids, and they could be used as coasters to protect surfaces, but there is a warning about damage which it can cause to certain types of finishes.
The red rubber gripper we owned had disintegrated, and when I saw these on the grocery aisle, I bought a pack. There were four grippers. I gave two away to friends because, how many of these do you need? Maybe one in the kitchen and one in the garage?
There’s nothing fancy about these. They are simply a perforated soft, rubbery circle of material. Each one is 5.5 inches in diameter. I don’t know what the material is that they are made from, but I have similar refrigerator tray mats and they say 100% vinyl. However, these Grip-Its carry a warning that they can damage urethane or lacquered surfaces. So if you use these as a mat, perhaps under a plant pot, you might want to be careful about that.
The size is perfect for jam jars and regular mouth canning jars. It will work, but is barely adequate, for wide mouth canning jars. I like it better than the solid rubber one, because it conforms more easily to the jar, and you can really hang on to it
I keep mine in a drawer, but the perforated pattern would make it possible to hang these on a small hook quite easily.
The company makes various products in this type of material which allows good circulation. I have some in my refrigerator drawers. The material has been made into everything from colorful placemats to utilitarian carpet padding or produce display case liners.