American Made Lucky 13 Real Brass Knuckles. Made of 100% pure brass, with a lucky 13 symbol cut in the palm area. They come with a black velvet carrying case inside of a gift box. These are NOT cheap, casted, forged, aluminum, steel or plastic knuckles that you normally see from China that can be bought for $10. These are made from real brass, and the material alone costs double that amount. These are very high end, valuable and collectable.