They're synthetic rollers you can use for the rear roller setup. Double rollers are suitable to setups for novices specifically, since they're easy to fit, offer smooth, stable cornering, and help stop your vehicle from bouncing on the program wall surface due to the utmost effective rollers.
• Rollers are molded in low-friction POM synthetic (black).
• Attachment of Item 94752 (520 ball bearings) and 94768 (Bearing Roller Spacer) offer more superior functionality.
• 13mm (top and base) Double Rollers x2
• Screws and steel components included.
• suitable for the MA, VZ, and AR framework automobiles. Some figures may necessitate modification.