They truly are HG (High-Grade) ball bearings to be used on Mini 4WD services and products. Versus standard ball bearings, they offer more accurate elements leading to also smoother rotation gears, axles, and more from your own Mini 4WD vehicle.
• HG 620 Ball Bearings x4
• Thickness: 2.5mm.
• appropriate all Mini 4WD and Mini 4WD PRO automobiles except the type 1 framework.