The 16mm EVO Front Shock Spring is an essential component for enhancing the performance of your RC vehicles, specifically designed for the 8B 4.0 and 8X models. This green spring, with a rate of 4.9, improves the handling and responsiveness of your suspension system, allowing for better traction and stability on various terrains. Sold in a pack of two, these springs ensure you have the necessary components for optimal front shock performance, providing durability and dependability in demanding conditions.