Splash, after reviewing the website above, I am not sure they can be bought for one axle. The "Stage 1" kit that does both axles and includes the better springs and hardware starts at $225.00. According to them, the cryogenically treated semi kevlar dissipates heat much more rapidly. But I am still not to sure how that relates to the wear factor on the stock drums. This has peaked my interest, and I will call them when I get some time on Tuesday morning to get their take on it. But would still like to hear more from the "real" world.