SR14-2RS Premium ABEC-5 Sealed Bearing 7/8" x 1-7/8" x 1/2" BearingSR14 2RS Sealed Ball Bearing Premium ABEC 5 Quality with Si3N4 Ceramic Balls (Silicon Nitride) 7 8" x 1 7 8" x 1 2" Inch SR14 2RS Bearing is double sealed, radial and deep groove ball bearing,SR14 2RS bearing is made from stainless steel with Ceramic Balls (Si3N4) and Stainless steel cage,bearing is closed with rubber seals to protect the bearing from dust or any possible contamination,SR14 2RS bearing is sealed and self lubricated,the quality is set