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●  DK-10503ZZ    Premium Racing Bearing 5×10×3 (2pcs) 
●  DK-1050ZZ    Premium Racing Bearing 5×10×4 (4pcs) 
●  DK-1510ZZ    Premium Racing Bearing 10×15×4 (4pcs) 
●  DK-840ZZ    Premium Racing Bearing 4×8×3 (4pcs) 
●  DK-850ZZ    Premium Racing Bearing 5×8×2.5 (4pcs) 
- Product Detail View -
 
Premium Racing Bearing 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. (DK-10503ZZ is metal shielded)

Premium Racing Bearing makes them especially useful in demanding applications such as all category.
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