This is a lightweight 17mm aluminum ball-race rollers that are now available to tune your Mini 4WD car. These rollers offer less weight and a slight boost in speed, in addition to superior durability and silky-smooth rotation.
• 17mm Lightweight Aluminum Ball-Race Rollers x2
• Eight holes in each roller alllow for a person weight of 0.81 grams, a saving of roughly 0.25 grms per roller.
• tiny parts for accessory are included.
• Built-in 520 ball bearings offer smooth roll.
• appropriate for Mini 4WD and Mini 4WD PRO vehicles. Some bodies may need modification.