Steelwallet Pro

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Only the first four letters are needed to uniquely identify the word from the BIP-39 word list. The first four letters allow to determine the entire word in the list. Some wallets like the BitBox02 automatically complete the word for you once you've entered the first few characters.

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Yes, there are multiple tiles available for each letter, depending on their frequency in the BIP-39 word list. Randomly created recovery phrases can be pieced together with plenty of tiles to spare.

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No, the letter tiles are securely locked in place using spring plungers at the end of each groove. They have to be pressed down with force to add or remove tiles, preventing tiles from sliding out accidentally.

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Whoever has access to your recovery words, gains full control over your wallet. In case your Steelwallet Pro gets stolen, you should immediately withdraw your funds from your hardware wallet and transfer it to a new wallet that has a different seed.

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The remaining sets of letter tiles reveal which letters were used for the Steelwallet Pro backup, but without any information about the exact words or their order. The amount of possible combinations is so large that the effect is negligible and not a relevant security factor.