Bore Size:8 mm Outside Diameter:14 mm Precision Rating:ABEC-1 ABEC-3 ABEC-5 ABEC-7 Seals Type:Sealed of Row:Single Row Diameter:8x14x4 mm Cage Retainer type:Stainless cage or brass cage Material:Chrome steel Balls:Chrome balls Lubrication:Grease,Oil or Dry Vibration level codes:V4, V3, V2, V1