Check the listing for details. HUBDOCTOR NOVATEC D711SB, D712SB HYBRID CERAMIC BALLBEARING KIT. Condition: New. Listed at 41.55 USD. HUBDOCTOR NOVATEC D711SB, D712SB HYBRID CERAMIC BALLBEARING KIT Replaces the front hub, rear hub and freehub bearings. 6902-2RS HYBRID CERAMIC Si3N4 ABEC5 BALL BEARING KIT 6 QTY. TOTAL (6) Qty. top quality (ABEC 5) 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. 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.