Tamiya Mini 4WD Upgrade Parts Series 437 13mm Bearing Roller 15437 No. GP.437 All-Aluminum

Mini 4WD Upgrade Parts 13mm diameter machined aluminum rollers allow for a wider range of roller settings The body is equipped with a 520 bearing for smooth rotation. The rollers do not have rubber or plastic rings around them, so they can be installed front or back. Another key point is that it is lightweight, weighing just 1.7g for two bearings, which is less than half the weight of a 13mm ball bearing for rollers.