Push your Arrma Mini Kraton drivetrain to the next level with Hot Racing HD steel differential outdrives, built for extreme strength, smoother power delivery, and rock-solid durability. CNC-machined from hardened carbon steel, they are significantly stronger than stock, reducing wear, drivetrain slop, and vibration for more stable handling and reliable torque transfer. Designed for smooth, efficient performance while remaining compatible with the factory wheel hex hubs. Sold as a set of two.