I just posted a threat to r/askreddit, but I'm impatient and looking for more opinions, so you get it too.
You've got a supreme badass. "Balls of steel" would be selling the badassitude really short. Clearly his balls are made of something better, but what? What aspect should be emphasized over the myriad quantities of steel to make it seem better? I can't decide on a real "right" answer, so I want your opinions.
Denser materials, like lead, certainly seem like an obvious choice, especially for gun users. But lead doesn't seem like it's cool enough to warrant the title. Besides, lead poisoning straight from your guys? Not fun.
Tensile strength might do, but there's not too many materials stronger than steel whose names roll off the tongue nicely. "Balls of carbon fiber" just doesn't have the same ring to it.
Rigidity is also important, but that doesn't necessarily mean "tough." Diamond, for example, is very rigid, but also brittle, and hardly seems appropriate.
I'm looking for all answers, folks. This is important to bro debates everywhere!
