2 Pcs Hybrid 6806 Ceramic Bearing 30x42x7mm 6806 2RS Si3N4 Ceramic Ball Bearing for Racing Bike Wheel BB30

6806-2RS Ball Bearing Premium ABEC-5 Quality with Si3N4 Ceramic Balls (Silicon Nitride) 30x42x7 mm Sealed Bearings 6806-2RS S6806-2RS Bearing, categorized as thick section, double sealed, radial and deep groove ball bearings, 6806-2RS bearing is made of Precision Steel with Ceramic Balls (Si3N4) and Nylon cage, 6806-2RS bearing is closed with rubber seals to protect the bearing from dust or any possible contamination, 6806-2RS bearing is sealed and self lubricated.