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Hybrid ceramic ball bearings use a combination of traditional stainless steel rings precision matched with silicon nitride (ceramic) balls. In addition to being excellent electric insulators, hybrid bearings have a higher speed capability and will provide longer service life than all-steel bearings in most applications. We use high precision Si3N4 balls for high speed. Sizes range from 6900-6906 also known as (61900-61906) available in 2RS (Rubber Sealed).