They are HG (High-Grade) ball bearings to be used on Mini 4WD products and services. Versus standard ball bearings, they feature more accurate elements ultimately causing also smoother rotation gears, axles, and much more from your Mini 4WD car.
• HG 620 Ball Bearings x4
• Thickness: 2.5mm.
• appropriate all Mini 4WD and Mini 4WD professional cars except the kind 1 framework.
