Simple and economical way to cut down on vibration pollution. I use in concert with other, more expensive anti-vibration devices. If your gear sits on three points, buy three packages and you have enough to treat four components. AR stuff can be hard to find. But not these apparently.
I have speaker 4 footer with round end under my each of my speakers. I was going to install spikes but wasn't sure would to use with them on the hardwood floors. I decided to try these devices under the round footers and notice a bit more focus with the speakers with less vibration going to the floor.