Traxxas spring, shock (gtr) (4. 1 rate tan) description: gtr shock springs use high-quality spring steel with a durable red powder-coated finish. Gtr springs are offered in different rates to tune your suspension performance or compensate for lighter or heavier vehicle configurations. The higher the rate, the stiffer the spring. (4. 1 rate tan stripe) (sold in pairs) replacement part for these models: e-revo vxl brushless accessory part for these models: revo slayer pro 4x4 summit