6902 2RS 15mm ID, 28mm OD, 7mm Width, Si3N4 Hybrid Ceramic Ball Bearing Rubber Sealed ABBOTT Go to amazon.com Related posts Which is the best 6902 bearing ceramic? FeatureBalls: Si3N4 Silicon Nitride ceramic ballsType: Deep groove ball bearingCage: Nylon high speed balls retainerClosures: 2 x rubber sealed