I had to buy one of these.
It's a heavy metal disk about 3" in diameter and 1/2" thick. It also includes a large polished concave platform to spin the disk on. The main spinning action is like the wobbling / spinning that you see at the end of when you spin a coin.
So you give the disk a light spin.
After half a minute, it's still going and you think ok, not bad.
After a minute, it's still going and you think, wow, that's pretty good.
After a minute and a half, it's still going and you think this is crazy.
And at two minutes, when it finally stops, you don't know what to think.
Pretty neat
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