chrome steel bearing1. Quality level: reach the same level as Japan and European bearings2. Tolerance level: ABEC-3 (P6) ABEC-5 (P5) ABEC-7 (P4)3. Less friction and lowest noisy4. High speed5. All size deep groove ball bearingVisit more: www.xzbearings.com/en/chrome-steel--bearing-128.html
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