These lightweight yet tough 19mm aluminum rollers work integral 520 ball bearings to present your Mini 4WD device with smooth motion. Also, they might be helpful for both front component and straight back roller setups. The components have actually an anodized blue finish for an incredible appearance!
• 19mm Aluminum Ball-Race Roller x2
• Attachment screws included.
• right for all Mini 4WD and Mini 4WD professional cars.