The 6439 x0-1 aluminum steering blocks in blue are designed as a high-strength upgrade for compatible traxxas 4x4 rc vehicles. Machined from 6061-t6 aluminum, they provide increased rigidity and durability compared to stock plastic components, helping maintain precise steering geometry under high-speed driving, jumps, and rough off-road conditions. The lightweight design ensures improved performance without adding unnecessary weight, while the anodized blue finish offers corrosion resistance and a clean custom look. These steering blocks are compatible with traxxas hoss 4x4 vxl, rustler 4x4 vxl, slash 4x4, and stampede 4x4 platforms that use the x0-1 series steering block configuration.