1.) Made for the professional Supermotard & Motocross racer. 2.) The lightweight high-performance racing chain is the result of innovative metal alloys and the latest manufacturing technology. 3.) MXZ chains - Chrome alloy steel construction with seamless rollers and bushes, and oversized specially hardened bolts for extra stability. 4.) All versions are heat treated by the RK exclusive HIT process (Heat Induction Transfer). 5.) 428 MXZ high-performance racing chains are among the strongest in their class and have an excellent price-performance ratio relative to all MX racing chains worldwide!