UPDATED REVIEW : 09/15/20/; After 3000 miles they don't work as well as ceramic balls. I have used ceramics in 12 tires on 2 different trucks over the last 8 years. And never had a single balancing issue. On the other hand, there aren't that many. They should hold together in the hoop. I happen to get a basketball effect while driving, the tires bounce due to imbalance. I've never had that with ceramics. But do with these. So my advice is don't waste your money on this. For me, I'll stick with ceramic beads. Unfortunately I have to remove all four tires and get that crap off of them. First Review: I've been using Dynabeads in my truck tires for years. And they work great. I decided to try them this time. So far, so good.