OFGS, you guys. (If you're not deadpan joking.) That is depleted uranium. They use that for compact elevator counterweights, and in aviation. It is an alpha-emitter that has a half-life the age of the Earth: 4.5 billion years. This particular isotope of uranium metal isn't even really the active principle in reactor fuel: that requires enrichment in the fissionable U-235 to a content from about 5 to 20 percent.
Those boys were running a scam.
Though you could kill a guy by dropping it on his head out of a third-floor window. Aim right and it could be lethal enough.
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Wanna stop school shootings? End Gun-Free Zones, of course.
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