These are individual aluminum cylinder caps from the upgraded TRF Shock Damper Upgrade set. They are available separately for those who need spare caps to their newly upgraded shock dampers.  - Cylinder Caps x4  - Designed specifically for use with 5.8mm damper ball connector nuts (Item 42344).  - Aluminum components have the TAMIYA blue anodized finish.  - For use with Item 54871 and 42344.