Barney Ross refers to his favorite brass knuckles as “The Classics”. "The Classics" serve as Barney Ross' melee weapon. Being more of the brawler-type fighter, Barney uses brass knuckles to increase his punching power and deliver deadly hard kills to his enemies. Lee Christmas uses dual "Classics". These are seen in the bar brawl scene in The Expendables 2.
Barney Ross seen with his "classics."
Lee Christmas seen in another shot with his knuckles in the closing film titles.