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ABEC 7 precision with Grade 5 ceramic balls made from our World Champion Ceramic Nitride Pro Series Bearing Material. 17x30x7mm Ceramic Ball Bearing size 6903 ball bearing. This 17x30mm bearing is a super high performance ceramic bearing which can be used for many high performance applications including bicycles (this is a direct performance upgrade for a Fulcrum R4-004 bearing) and as a direct performance upgrade and replacement for the HPI Baja.