Coldbit Steel can be purchased at coldbit.com. It’s constructed of a 4mm thick stainless steel plate, a 2mm thick stainless steel cover, and 2 nickel binding posts. It’s designed to withstand house fires, flood, electrical shock, extreme temperatures (up to 2192°F / 1200°C) and humidity. Nice touches are that the Coldbit Steel came with a stamping plate, ear plugs, and the Coldbit Passphrase hex rod.
It was nice that this came with a stamping plate, though I felt like the stamping plate I bought for $5 on Amazon was far superior.
Heat Stress Test
Discoloration but no data loss.
Corrosion Stress Test
No data loss; even the freehand etchings were legible.
Crush Stress Test
Hard to read, but no data loss.