Model: SMR74C 2OS Inner (d): 4 mm Outer (D): 7 mm Width (B): 2.5 mm Grade: ABEC-7 Material: Stainless Steel Rings Closures: Non-Contact Rubber Sealed Balls: Si3N4 Ceramic Balls Lubrication: Self Lubricated ( NO Grease) Qty: You will get 2 pieces ball bearings

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