These are rubber sealed ball bearings, which offer smooth rotation, great precision of attachment and even simplified maintenance.
• 850 Sealed Ball Bearings x2
• Applications include TRF420 and TA07MS center shaft area, and M-chassis gears.
• Using ball bearings in place of plastic and metal bearings gives better parts fit and more efficient rotation.
• These ball bearings employ rubber seals rather than metal ones – this allows you to open them up to clean and work on them.
• Low-friction oil is used to lubricate the internal workings.