Previous speakers, I agree wholeheartedly - is truly extraordinary material. What more can I add More? The material is extremely hard, it can therefore hardly be scratched. The breaking strength is the hardened steel in the shade; the ring is practically non-deformable. As a chemist, it is also important to me that occasional acid splashes on the fingers (can also despite protective gloves not entirely rule out) the ring not hurt. Compared to non-oxidizing acids, the alloy is resistant to corrosion even at the boiling point. In short, the material is virtually indestructible. Only with the pliers to the ring would "crack", but who (except in an emergency, the emergency physician) does it matter?
Even the suppliers, I can only report good: The rings were there within 3 days. Since I accidentally shopped too big, I sent it back without further ado. The return shipment is free of charge. You can fill out a return form, glue on the parcel and make the order online Undo the Internet. The confirmation was prompt via email, within a few days I got my money back. Of course, I bought the rings all over again in the correct size ...
Conclusion: 5 stars.
Addendum [02:09:13] The ring contains small amounts of cobalt and nickel, is therefore to be classified as potentially allergenic. My girlfriend, for example reacts allergic. Therefore, subsequently a point deduction!