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We can provide metric and English size ceramic ball bearings, according to customer demand, these ceramic ball bearings can be made into open or sealed type. Performance comparison of four kinds of bearing materials: ordinary bearing steel aisi52100 (GCr15), stainless steel aisi440 (9Cr18), silicon nitride (Si3N4) and zirconia (ZrO2). Ceramic bearing, as an important basic mechanical part, is the first in the new material world due to its incomparable excellent performance compared with metal bearing. In the past decade, it has been widely used in various fields of the national economy and people livelihood.