The ColdTi is a simple device, which means not too much can go wrong. However, if you're entrusting your keys to it, you might be concerned about a couple of its design choices. The ColdTi is made of titanium, which is less dense than the steel used in other physical wallets. 316 Marine Grade Steel is usually considered the best material for seed backup devices. The screws are poorly designed and make it frustrating to use the wallet. And the fact that you can't wipe a phrase from the metal plates means it may end up being a liability rather than a help.