Nothing much can be said about these spherical objects except they are perfect.
At each 1 kg "exactly", they are smooth to near 0.0000000003 of a meter.
These silicone balls were made in Australia's Commonwealth Scientific and Industrial Research Organization aka CSIRO as they didn't want to depend on the International Prototype Kilogram of the le Système international d'unités.
So as they say in Australia...
"Our balls are better than your balls, mate!"
Source : Makezine
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