Captain America carries a virtually indestructible shield composed of a unique Vibranium-steel alloy created through a process that has never been duplicated. A concave disk two and a half feet in diameter and weighting twelve pounts, the shield has excellent aerodynamic properties and can be hurled to rebound off of solid objects with minimal loss of angular motion. Captain America has long since honed its use to the point that he can use it to defflect attacks and knock out adversaries in tandem with his own acrobatic skill. The shield is impenetrable by even the strongest Adamantium, resistant to all temperature extremes, and unaffected by any known form of radiation; the only way it can be damaged is by the direct breakdown of its molecular bonding.