silicon nitride ceramic ring long professional
High Performance Silicon Nitride Ceramic Deep Groove Ball ... Silicon Nitride Ceramic Deep Groove Ball Bearing - F eature with, 1) Silicone Nitride is the best ceramic material used for the ceramic bearings. 2) It has the density 3.20g/cm3 ,and is only half weight of zirconia bearings. 3) More light means more speed. 4) Chemical resistant.
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