I used cat litter in my Skylan stands but didn't really seem to do much so I took it out. I couldn't get the Star Sound for a long time because their supplier went out of business suddenly and they had to find another. I have not done a scientific test because the Micro Bearings are so small I only want to put them in welded stands. Right now I have them in 15" Target stands I use with Spendor SP1/2s. I have the Atabits in a pair of 20" Atacama stands I use with Mini Utopia Focal speakers. I like the Micro Bearings because they seem to be the most effective is damping the resonance of the steel stands, VERY heavy for their volume. I was using lead shot but I thought it caused a coloration in the sound I don't hear with the MBs. Just my impressions. The MB seem even heavier than the same volume of lead shot, I haven't measured this and both are heavy. Lead is, of course, considerably heavier than steel but the MBs are much smaller than the lead shot so you can gat many more into the same volume.