Jameson Lopp tested most of the metal seed storage devices and showed that majority of them is not resistant to high temperature or fire and they can get damaged very easy and become unusable. That means that seed words could not be read and recovered.
For example you have Steeldisk, Ballet Crypto,BitHD Frozen Armor, Bunkeroid, Ellipal Mnemonic Metal that all failed every test he made and got rated
F as we can see here:
https://jlopp.github.io/metal-bitcoin-storage-reviews/I knew these reviews and rates of Jameson Lopp on his site. I left a link to his reviews when I created the topic but I did not bring all details of his table in the OP. OP is simple with metal sheet providers and price then you can get more details on jlopp.github.io site.
Most of them are also overpriced, like Bunkeroid for example that cost $130 and failed every test, or Quadrat Register with €365 that passed the test but I would never spent so much money for this purpose.
It is for information and you can apply the encrypted methodology for your metal sheet. I don't think you must buy metal sheets from those providers if you don't want or if you think they are expensive.
You can create yours (with better or lower quality) but metal sheets are better than paper, obviously. I am sure about that.
Please read and consider for your mental sheet in the future. I don't have any mental sheet.
