I used this group:
http://www.innovativebalancing.com/index.php
Here is how it works:
http://www.innovativebalancing.com/HowItWorks.htm
The ceramic bead size varies from about .015 to .045.
Certified to 150 MPH here
NOTE: You cannot have ANYTHING sticky inside of the tires, or the beads will stick into position and cause imbalance. This actually drove me nuts with a brand new set of BFG's, as they were so fresh that they were a bit sticky inside. It took a few miles of use along with some pounding to finally get them to act right. I was actually a little pissed intitially, and was just getting ready to have the tires taken back off so I could clean the beads out. I ran on a hunch that this could clear up, and it did (within about 50 miles). Any excessive bead sealer, water, or anything sticky will prevent the beads from functioning correctly. The other vehicles I have used this on have had seasoned tires and the results were immediate, so brand new super sticky tires may actually benefit from a small "wiff" of baby powder if they are gummy inside to keep the beads from sticking initially.
I have since "spiked" all of our vehicles with these beads, and my wife even noticed the difference in the minivan, even though we felt it was smooth and proper prior (nice mid life Michelins).
I recommend 4 ounces per tire DBS-4 (will need one per tire), the COR-01 filtered valve cores, and the APP-02 applicator bottle:
http://www.innovativebalancing.com/gallery1.htm
Again, your results may vary, but I'm very sold on the tech!