Traxxas left and right aluminum caster blocks (C-hubs) take an already proven design and ratchet up the toughness and durability with 6061-T6 aluminum. The hubs are carefully machined from a block of aluminum to preserve their steering and suspension geometry. The brilliant anodized finish and TRX logo add high-tech, two-tone style to your machine. Includes 3x8 mm screws with threadlock (6).