With the current Tamiya Mini 4WD racing regulations, only these double rollers count as one roller. 12mm diameter roller set in the upper position and the 13mm in the lower position, improves your stability greatly and also assists cornering ability.
Can be used with any Mini 4WD & Mini 4WD PRO machines
★These precision aluminum components each feature integrated 12mm and 13mm rollers.
★13mm roller sections come into contact with the course fence on straights, and 12mm roller sections during corners.
★Also included are 520 ball bearings and other small parts for attachment.