There are several metals which have been described as unbreakable, indestructible, or the hardest or strongest in the DCU at one time or another. We have seen planets towed by chains, and while planets are pretty solid from our POV, they might as well be made from toothpaste from the POV of someone strong enough to tow a dozen or more of them at once, as the Silver Age Superboy once did. Much like Supermanium, it's created by crushing other elements to make the ' heaviest and strongest element of all'.

What is the strongest metal in the DC universe? - Science

Marvel has never officially clarified whether True Adamantium is stronger than enhanted uru, or vice versa, for example. Wonder Woman has always worn a pair of these metal cuffs, but the design and model has varied over the years. It loses points because it gets destructed repeatedly, by Karate Kid, Superboy, Element Lad, Mon-El and various others over the next few decades. It has been specified that Captain America's shield is stronger than True Adamantium, but is it stronger than the Destroyer armour? When I bequeathed the shield to my daughter, Athena, she, unbeknownst to me, had Hephaestus reforge the loose fragments.

Additionally, Promethium was introduced late in the Pre-Crisis era, but also exists in the later Post-Crisis continuity, and the current Prime Earth continuity as well. The history behind the Bracelets of Submission was developed by William Moulton Marston, who created Wonder Woman, and the bracelets themselves actually had real-life counterpart: Marston's lover Olive Byrne – upon whom much of Wonder Woman's original character was based – frequently wore bracelets that directly inspired the Bracelets of Submission.

Bracelets of Submission | DC Database | Fandom

In the current Prime Earth continuity, Kerenthium Steel was purported to be the strongest metal in the universe, but was broken by Superman. The bracelets had one serious disadvantage, however, as they would remove the wearer's strength if any man welded chains on them. the impenetrable shield formed from the hide of the Great Goat Amaltheia, who wet-nursed the infant Zeus and thus provided the energy from which Olympus sprung. She uses the bracelets as her primary method of defense, deflecting gunfire, blasts, small missiles and other projectile weaponry.