All the Ultrons in Age of Ultron are gold, and I think the only gold metal that is stronger than a Adimantium Vibrainum Compound is Adamantine.
Are The New Ultrons Made of Adamantine
they may actually be made of SPOILER human beings, when red hulk punchs ones head off a spine and blood fly out aswell, and from what i understand from the first issue ultron is infecting people with something, so it may even be some form of organic metal, ultron was able to infect and completely reform iron man into the form of his "mother" the wasp when mighty avengers began so its not a completely ridiculous theory. SPOILER
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