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Lead bricks are commonly used as radiation shielding. Lead shielding refers to the use of lead as a form of radiation protection to shield people or objects from radiation so as to reduce the effective dose.
Captain America's shield is his primary weapon. The most well-known of his shields is a disc shaped object with a five-pointed star design in its center, within blue, red, and white concentric circles. This shield is composed of a unique alloy of Vibranium, steel, and an unknown third component.