<P> Captain America's shield is virtually indestructible under normal conditions; while cosmic and magical or godly opponents have broken the shield, the shield proves strong enough to absorb Hulk's strength, and repel an attack from Thor's mystical hammer Mjölnir without any visible damage . As it is made of vibranium, it is able to absorb all kinetic energy and transfers very little energy from each impact, meaning Captain America does not feel recoil or transferred impact forces from blocking attacks . These physical properties also means the shield can bounce off of most smooth surfaces, ricocheting multiple times with minimal loss in aerodynamic stability or velocity . The shield can also absorb the kinetic impact of a fall, allowing Captain America to land safely even when jumping off of several stories, as can be seen in Captain America: Winter Soldier movie when he escaped from the S.H.I.E.L.D.'s STRIKE squad by jumping off an elevator . </P> <P> A common misconception is that the shield can "magically" return to Captain America . The "superhuman serum" that enhanced Captain America's physical attributes also improved his mental faculties--such as cognition, perception, balance, aim, and reflexes--to near genius - level . This allows him to instantly calculate ballistic - physics and predict the probable trajectory of objects in motion . This makes him a perfect shot . He can dodge or deflect bullets with his shield without collateral ricochet to civilians, to calculate where or how the shield will bounce and when it will return to his location, or trip a running person to cause them to fall into a specific position . In Avengers: Age of Ultron, he pulls the shield back to him after it is stuck, but this is through an electromagnet fastened on his arm . After his memories are altered to make him believe that he is a Hydra sleeper agent, Rogers uses his precise knowledge of the shield to put Sam Wilson, its current wielder, in a position where he will fail to save a senator from Flag - Smasher by arranging for Wilson to be forced to throw the shield in a manner that Rogers knows from his own experience will miss its target by mere millimetres, as part of his agenda to undermine Sam's status as Captain America . </P> <P> In his debut, Captain America (secretly U.S. Army Private Steve Rogers) is equipped with a triangular, badge - shaped shield made from vibranium . After complaints by rival comic - book publisher MLJ that the design was too similar to that of its own patriotic hero the Shield, Timely Comics replaced the triangular shield with a disc - shaped one . </P> <P> While the origin and fate of the original shield were not described in the original comics from the 1940s, the shield's fate was revealed decades later in 2001 through a retconned story . According to the tale, King T'Chaka of the African nation Wakanda met Captain America in early 1941 and gave him a second sample of vibranium, an alien metal with unique vibration absorption properties and found only in Wakanda and the Savage Land . The new Vibranium sample was used to make Captain America's circular shield and his triangular one was retired . </P>

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