This is a pack of two "Black - 0.767 Rate" Traxxas Progressive Rate Long GTR Shock Springs. These are the medium rate progressive springs available for the Long shock (TRA7461X). Traxxas offers a wide variety of spring rates for the GTR shocks to provide almost limitless tuning possibilities. The springs are made from high-quality spring steel with durable powder-coated finishes, and the spring rate is indicated by colored dots on the end of the spring.