They're plastic sealed ball bearings, that provide smooth rotation, great accuracy of accessory and even simplified maintenance.
• 1060 Sealed Ball Bearings x2
• Applications include F104 framework motor mount back shaft area.
• utilizing ball bearings in place of synthetic and steel bearings provides more efficient rotation and better parts setup.
• These ball bearings use blue plastic seals rather than metal ones – this enables one to open up the bearings to clean and work with them. Blue plastic seals also vastly help in the prevention of debris going into the competition roller.
• Low-viscosity oil is used to lubricate the interior workings.
• Periodically perform upkeep such as including oil; after crashes, checking bearing motion is recommended.