★These are 6-spoke versions of race-spec ball bearing-fitted rollers in lightweight and durable aluminum. ★520 ball bearings come pre-installed for super smooth rotation. ★Components feature a reversible design. ★Plastic rings for the outside are molded in a lively shade of red. ★Small parts such as screws and spacers are included for use in attchment. Compatible Cars Mini 4WD and Mini 4WD PRO cars *Some bodies may require modification.