Grade Up Parts Series No. 475 Mini 4WD 13mm Dia. Roller Ball Bearings (2pcs.) II Item No: 15475 ★Ball bearings are a must-have racing upgrade for Mini 4WD machines, facilitating smoother rotation and helping keep speed and stability as the car zooms around the course. ★Steel casings make for long-lasting, durable parts. *Outer diameter: 13mm, Inner diameter: 5mm, Thickness: 3mm. The information on this page is current as of May 29, 2014. Specifications are subject…