The Traxxas 8964X Blue Shock Caps are replacement or upgrade components designed for Traxxas vehicles with oil-filled shocks, including models like the Traxxas Slash 4X4 and Traxxas Rustler 4X4. Made from anodized blue aluminum, these shock caps provide a durable and precise seal for the shock bodies, helping to maintain consistent damping and prevent oil leaks. Built by Traxxas, they are fully compatible with the corresponding shock assemblies, making them an ideal replacement for worn or damaged caps or a simple aesthetic upgrade for enhanced scale appearance.