Military grade steel, and I would not risk using a passphrase on a trezor or ledger.

Make sure the words are pre-programed on his signing device to avoid spelling mistakes.

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ColdCard and steel ✅✅

So you’re saying yes - use steel - for the passphrase (and store separately) for someone who is new to this, but is a quick learner?

When you say pre-programmed do you mean the feature where, when you begin typing a word, it suggests a list of possibilities according to the first letter(s)?