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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A bunch of us tried this tweak and it worked pretty good: purchase a big container of bee bees and multiple small plastic containers that measure 2”x 2”x 2” and fill this little containers with the bee bees. I placed multiple containers on each piece of equipment. A $20 tweak for multiple components.
Mass loading is a load of tripe.  Pure snake oil.   As others have mentioned; I sometimes place heavy objects (the stainless doorstops work nicely) on small electronics to prevent the cables dragging them around.  

I also do this for my multiport USB chargers.
Add "bee bees"!?  Talk about introducing a "buzz" into an audiophile system....
I use empty, crushed cans of Guinness on my components.

I get dynamic, expansive, 3D memories.
Black light posters, speakers in nets, lava lights...real tweaks. And those light machines that synced with the music. True enhancements. Not a bunch of boring rocks hyped by equally boring mass loading shills. No mass.