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Unless you have the correct feat, then it can be a monk weapon.Whenever he makes a flurry of blows, he can designate one of his unarmed strikes as a style strike.It can be any attack during a flurry of blows but must be an unarmed strike.
Don't ask how you headbutt using brass knuckles. There in lies madness!
It's a punch, I tell you! YOU CAN'T HEADBUTT WITH YOUR FISTS!