It’s everything you’d want out of a stainless steel wallet card: credit card sized with a simple design, satisfyingly heavy and inflexible with a brushed-steel sheen that says sexy. It would also be great for shimmying open doors and any number of other prying, jabbing tasks.
According to their site, the card is made from AMS 5524 stainless steel which is proof against fire up to 2500° F. The QR codes and address are etched with a ceramic-glass which bonds with the metal underneath, so that even if you were to somehow get the material off, the odds are good that the metal would remain marked underneath. Make no mistake, this is meant to survive a house fire.
I’m not going to put it through the fire test, though others have.
The only possible improvement I can imagine would be to include an alphanumeric version of the encrypted key on the back, in addition to the QR code, although I can’t think of a concrete use case where that would be necessary — sometimes more options are better, though.
This is about as simple and durable a cold storage solution as one can easily imagine. Whether you decide to tuck it in the back of a drawer, bury it in the back yard, or carry it in your wallet to impress your friends (“It’s better than a platinum card, it’s stainless steel!“, the Cryo Card is ready.