These Enduro bearings are high precision balls are within 101000000 round It is twice as round as the industry standard at its highest level They have been engineered to military level specificationsFeatures Vacuum degassed process for the purest chromium alloy steel 52100 high carbon Chromium alloy races Meets ABEC 3 standard Extremely tough and very durable Polished to a mirror finish for ABEC3 precision and noiseless movement

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