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The Boca Bearings Ceramic C-HIP Bicycle bearing series allows you to ride further and faster, and last longer thanks to the hardened steel races and superior dense ceramic balls. These Grade 5 Si3N4 balls are made using a hot isostatic press, making them even denser and more robust than other ceramic balls. These are excellent aftermarket bearings to upgrade your bike bearings. We are so confident in these bearings, we are offering a 2 year warranty. Kit contains: (4) 3-6901C, 1-6902C
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