They are HG (High-Grade) ball bearings to be used on Mini 4WD devices. In comparison to standard ball bearings, they provide more precise elements causing even smoother rotation gears, axles, and more from your own Mini 4WD vehicle.
• HG 620 Ball Bearings x4
• Thickness: 2.5mm.
• appropriate for all Mini 4WD and Mini 4WD PRO cars except the sort 1 framework.
