Traxxas 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 adds high-tech style to your machine. Includes 4x22 mm suspension pins (4), 3x6 mm screws (4), and screw retainers (4).