Check the listing for details. 6903-2RS (4 PIECES) HYBRID CERAMIC Si3N4 4 PIECES. Condition: New. Listed at 32.19 USD. 6903-2RS (4) HYBRID CERAMIC Si3N4 4 PIECES 4 Qty. top quality (ABEC 7) hybrid ceramic sealed ball bearing. Beautifully ground and polished chrome steel races. Dual rubber seals provide a light no drag fit on the inner race. Black ceramic Si3N4 G5 grade balls provide the best wear resistance and lowest rolling resistance of hybrid style bearings. They are lubricated with synthetic oil for low rolling resistance. Perfect for bicycle hubs, or any place a conventional version is used. Combined shipping on international orders but please inform us as soon as you win an item that you are planning to bid on or purchase multiple items. We will credit your invoice to reflect the combined shipping. Description: * Item: Double Sealed Ball Bearings * Type: Deep groove radial ball bearings Material: Chrome Steel Races * Balls: Si3N4 Ceramic G5 (Silicon Nitride) Check out our other items, Including our HubDoctor® Mavic® Freehubs Rebuild Kits The cost-saving solution for rebuilding Mavic® cassette hubs.Seal color can be black or yellow but the specs are the same.