Here’s a little on the history of brass knuckles and a couple of pairs of them to choose from.
Long Way Down Solid Brass Knuckle Paper Weight Accessory
Busacca Gallery: Antique metal brass knuckle paperweight
Lucky Day Heavy Duty Buckle Knuckles Paperweight Accessory
Milspin 3/4lb Brass Knuckle We The People Solid Brass Paperweight – MILSPIN
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Watch Over Me 100% Pure Brass Knuckle Paper Weight Accessory
ABS Plastic Knuckles Unbreakable Lexan Paperweight - Shiny Gold
Black Brass Knuckle Duster Paper Weight – Panther Wholesale
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Brass Knuckles - Heavy Duty Knuckle Duster - 1/2 Pound
Creature Feature 100% Pure Brass Knuckles Wire Cut Design Paperweight Accessory
Is there a advantage to or reason why brass knuckles were made of brass as opposed to metal, steel, etc.? - Quora
Rebel Nation Knucks - Rebel Nation
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Skull Brass Knuckles FTW Duster Paper Weight - 100% Real Brass, Slash2Gash