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1. Hybrid Ceramic bearings,do not need Grease,it have special rustling sound 2.Super High Speed,Long Spin time. Bearing Type:Hybrid Ceramic Bearing Bearing Ring:High Quality Bearing Steel Rolling Elements:7 Black Ceramic Beads(Si3N4), High Temperature and Corrosion Resistance,Abrasion resistance,High Revs. Cage :Nylon ,The Material is Suitable for Highly Corrosive Environments or High speed Scene. Shield:Two-Sided Dust Cover Size: 8 * 22 * 7 (Inner * Outer * Height) / Unit: mm Limiting speed: 22,000 rev / min Comparison of Tolerance Class: ABEC-9