6866 Springs, rear (progressive, -10% rate, green) (2)

 Traxxas 6866 Rear Progressive Springs (green, ‑10% rate, 2) are a pair of progressive‑rate rear shock springs engineered to be 10 % softer than stock for improved small‑bump compliance and responsive handling on Traxxas 4×4 models like Slash 4×4, Stampede 4×4, Rally, and similar trucks; the custom‑wound, XX‑long springs feature a green‑coded rate and progressively stiffer compression to absorb hard landings while tuning suspension feel and performance.