Since the release of the first Slash 4×4, RPM customers have been asking for stronger front end components that could handle the punishment Traxxas 4wd trucks can dish out. RPM answers the call with their Caster & Steering Blocks for these awesome trucks. They started with a blank slate, drew in the necessary design elements, and built a design with a focus on punishment survivability. The core design of the caster blocks revolve around the lower-case “H” structure, which provides extreme rigidity to keep camber and caster setting locked in place while running normally, yet the materials provide serious impact absorption characteristics to prevent breakage when those “oops” moments inevitably arise.RPM steering blocks have also been engineered for durability, strength, rigidity and crash-survivability. More material surrounds the kingpin posts while smoother flowing turnbuckle arms assure consistent feel and performance from the steering system.RPM's Slash 4×4 / Stampede 4×4 / Rustler 4×4 front-end components are made from a trademark blend of indestructible materials, and come factory backed by a limited lifetime warranty for strength and durability you know you can trust!Tech Notes: RPM caster blocks and steering blocks for the Slash 4×4, Stampede 4×4, Rustler 4×4, Rally & Telluride are sold as a set, including 2 caster blocks and 2 spindle blocks. These parts are not interchangeable with stock or aftermarket steering blocks / caster blocks. Running any part of this system with other stock or aftermarket steering blocks or caster blocks may void the RPM warranty.