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TECHNICAL SPECS Item: S6702ZZ CB Structure: Deep Groove Bearing Material: 440C Stainless Steel Ball Material:Ceramic Si3N4 Bearing Type : Hybrid ceramic ball bearing Bore Dia (d): 15mm Outer Dia (D): 21mm Width (B): 4mm Closures: Metal Shielded(ZZ) Lubrication: Free of Grease Free of Runing Magnetic: little Hardness: 58HRC Corrosion Resistance: General Clearance: C0 Bearing Grades: ABEC 7 Hybrid Ceramic Bearing's Advantage Ceramic by its nature is lighter than metallic through about 2/3 the wieght, it's tougher than steel when it is in ball form and it is virtually frictionless since it is non-porous. A ceramic hybrid bearing has metal races with ceramic balls. The balls will never corrode or rust.