What are the circular discs people use on components?

Interesting for sure. Does anyone have any advice as to the amount of weight one should use? I assume it’s more for heavy amplifiers and less for lighter components  

If you've got circular ring above your component, then you're probably not in this world anymore.

I hope the people who buy these remember to check the blinker fluid in their cars.

@fthompson251 those are them ! 

So basically the discs are pretty much worthless.

I still wish there would begin designing more racks that have casters. I use a customized rack made from steel that comes with casters, from anchor.  It's well-made extremely solid and was really quite reasonable pricewise.  i think it’s insane to put a 150 pound amplifier on a rack that does not move and requires two people to help out.

How cool it would be to design a lift for internal use that you could wheel around to move amplifiers and speakers. Like the lift they use on the back of a pick up truck when they quickly move Indy cars from the road when they crash but of course on a different scale and separated from a pick up truck.