They're orange versions of low-friction plastic bearings first sold in Item 15523, that really help make sure that your Mini 4WD vehicle runs as next to maximum efficiency as you possibly can.
• Low-Friction 620 Plastic Bearings x5
• Low-Friction 520 Plastic Bearings x2
• 620 size components are to be used on hex shaft axles, while 520 size components are for use in Mini 4WD PRO vehicle counter gears.
• appropriate for Mini 4WD and Mini 4WD PRO vehicles.
