★19mm ball-race rollers are a favorite of top Mini 4WD racers; now you can soup up your machine in style with these commemorative Japan Cup 2021 versions. ★Lightweight aluminum components have a stylish black anodized finish with blue decorative print. ★Built in 520 ball bearings ensure silky smooth rotation. ★Also included are spacers and screws for attachment. Compatible Cars Mini 4WD & Mini 4WD PRO cars *Some bodies may require modification.