Black Bearing B5 bearings are hybrid bearings commonly referred to as "ceramic". Hybrid ceramic black bearing B5 ceramic bearings consist of the following elements: inner and outer rings made of treated stainless steel for better mechanical resistance. Compared to a standard steel bearing, the advantages of the Black Bearing B5 hybrid ceramic bearings are many. Weight savings (ceramic density < steel density), lasts at very high speeds, very long service life (multiple like a standard), less friction
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