I don't know what OCRC mixes in with their clay, but I know they run 70% Clay and then mix in some other stuff and it's hands down the best track I've driven on for traction and even more important that outright traction, is that it stays more consistent than any other track I've run on. This means, your perfect set up at the beginning of the day will still be the perfect setup at the end of the day and all day long in between. Some tracks differ so much throughout the day that you literally have to use different tires throughout the day or make other changes to the vehicle.