Real Brass Knuckles, Heavy Duty, with the number 13 artwork engraved in blue, weighs almost a pound! This thick item is made of solid brass. Has an overall length of 4.5 inches and a height of 2.5 inches. It has a solid and smooth finish. Large holes with a diameter of an inch. It's easy to clean and shines like new. Perfect for self defense. Could also be used as an interesting paper weight.