Brass knuckles are a weapon that is illegal in many states. FindLaw discusses laws pertaining to brass knuckles.
Brass Knuckles Under New York Law
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In The News – Andrea S. Ferrante Law
Ohioans for Concealed Carry
Are brass knuckles illegal in California? - Quora
This isn't a firearm (in the eyes of the Almighty ATF) : r/liberalgunowners
Milspin 3/4lb Brass Knuckle F*ck Around Find Out Solid Brass Paperweig – MILSPIN
Brass Knuckles Legal In Sc Discount Buying
Cincinnati Weapons Defense Attorneys
Brass Knuckle Laws in the United States
Traveler told TSA he had 'no idea' a sword was concealed in his cane : r/news
Milspin 3/4lb Brass Knuckle F*ck Around Find Out Solid Brass Paperweig – MILSPIN
Are brass knuckles illegal in California? - Quora