Robbie Dalton Brass Knuckles 13 Black. This item is made of real solid Brass. It has a solid and smooth finish. Huge holes with a diameter of an inch. It's easy to clean and shines like new. Weighs in at 10 ounces Length: 4.5" Height: 2.5" Almost 1/2 an inch of thickness Heavy Duty and Solid Brass