This product is a genuine Traxxas #4 X-Tal yellow shock spring set designed to fine-tune suspension performance and handling characteristics. These springs provide a specific spring rate ideal for adjusting ride height, cornering stability, and overall suspension response. They are manufactured to factory specifications for consistent performance and proper fitment. This spring set is compatible with Traxxas Slash 2WD, Slash 4x4, Rustler 2WD, Rustler 4x4, Stampede 2WD, Stampede 4x4, and Bandit models that use standard Traxxas shock assemblies. It is an excellent option for racers and bashers looking to dial in suspension setup.