Big Bore shocks provide optimal bump and jump control for your Traxxas model. Hard-anodized aluminum bodies, PTFE-coated shock bores, and titanium nitride coated shafts offer incredible durability and near frictionless operation for ultra-smooth damping and long-lasting performance. The all-inclusive kit contains 30-weight shock oil, ride height spacers, and progressive-rate springs for 2WD Slash models. For other models, use the springs included with your vehicle.