[ Precision Brass Weight Blocks ]Specifically engineered for the AXIAL SCX30 to enhance climbing performance, these blocks are CNC-machined from solid brass stock - (5.0g each) Mounted on the rear axle hubs, they effectively lower the vehicle's center of gravity, improving driving stability and climbing capability to create a more versatile crawler - Compatible with AXI-3320 rear axle, directly replacing stock plastic rear hubs