Premium Ceramic Bearing(mm size) use high temperatures oil type for high-speed rotation and realizing a maximum lighter drive train.
Their special construction with a protective black rubber seal on the outer side and a Super Low-Friction steel inner shield on the side maximum protection against the elements while optimising the drive train efficiency compared to all-rubber shielded ball races. (DH-10503ZZ is metal shielded)
Premium Ceramic Bearing makes them especially useful in demanding applications such as all category.
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