"A weapons-grade ring of electrorefined plutonium, typical of the rings refined at Los Alamos and sent to Rocky Flats for fabrication. The ring has a purity of 99.96%, weighs 5.3 kg, and is approx 11 cm in diameter. It is enough plutonium for one bomb core. The ring shape helps with criticality safety (less concentrated material)." - bob

The precious is heavy. - τorƍue

I wonder if there's anything engraved on the inside surface.. - Paul Buchheit

one ring to rule them all - Jerry Schuman

more like one ring to bomb them all - Chris Heath