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The Arc Reactor was a power core made out of palladium, and was the initial power source of the first Iron Man Mark suits.
Model dimensions (without wire):
Useful links:
http://marvel.wikia.com/wiki/Arc_Reactor
http://ironman.wikia.com/wiki/Arc_Reactor
https://www.youtube.com/watch?v=p-ACE8ANpU4
https://www.youtube.com/watch?v=-zya4vJ-kQE
https://www.youtube.com/watch?v=5Rb9hAHifFA
https://www.youtube.com/watch?v=sC4cl5xxi7Q&t=12s