What are all these metal cans/pods sitting on top of electronics?


John Darko the youtube reviewer has them on all his equipment. I see them on alot of people's electronics it's a tweak of some sort I just don't know what they are or what they do. 

Thanks,
Steve
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@spencem - I hope your vial holds a lot of those little suckers....  
At 0.000000000000000000000000223 kg each you might need to mass load your mass load.
Don't knock it till' you try it: cryo'd antimatter carefully balanced on top of a Stillpoint- Soundstage will extend beyond your walls and wrap itself around the planet.