This product takes the popular, high end aluminum ball-race rollers from Item 15522 and provides them a tapered underside which will help your Mini 4WD car allow it to be through to the end of this battle!
• 17mm rollers are crafted in durable, precision aluminum.
• Tapered undersides encourage your vehicle to have right back on track if it climbs or lands upon the walls.
• Each has a 520-ball bearing built in on center for super smooth rotation.
• Two screws and four aluminum spacers included.
• Compatible with Mini 4WD and Mini 4WD PRO automobiles. Some bodies might need modification.
