You're proud of him. Prouder than of anything you've done yourself. He probably doesn't know that.
Not because you don't feel it. Because saying it out loud isn't how you were raised, and it isn't how you operate. You show up. You fix things. You figure he can tell. Most dads do.
But a son who never hears it starts to wonder. Usually right when he most needs to know.
This is the kind of bracelet a man wears. Nothing soft about it. He'll put it on and forget it's there, until a day goes badly and he notices it on his wrist. Then he'll remember what the card said, and that it came from you.