They are extra back upright components for the TRF420 rushing car framework.
• TRF420 E Parts x1
• Components are molded in carbon fiber-reinforced plastic for superior rigidity.
• Bearing positions are precisely aligned for maximum effectiveness.
• For use with 3mm diameter shafts (offered in Item 51637).
• Compatible with cars using Item 51639 TRF420 D Parts (Suspension Arms).