Specification Brand : ZLB BulletPoint1 : Product Name : Linear Motion Ball Bearing;Model : LM12LUU BulletPoint2 : Material : Carbon Steel, Rubber;Inner Diameter : 12mm BulletPoint3 : Outer Diameter : 21mm;Length : 57mm BulletPoint4 : Color : Silver Tone BulletPoint5 : Package Content : 10 x Linear Motion Ball Bearing ExternallyAssignedProductIdentifier1 : 0757290463403 ExternallyAssignedProductIdentifier2 : 757290463403 ItemName : 10Pcs LM12LUU 12mm Longer Linear Ball Bearing Bushing Linear Bearings CNC 3D Printer Parts ItemPackageQuantity : 10 ItemTypeKeyword : linear-ball-bearings Manufacturer : ZLB Material : Steel NumberOfItems : 10 PartNumber : UK#KC215031100204-10@OWOB ProductDescription : The universal Ball Bearings is great for you to replace the damaged Ball Bearings in your devices to improve them efficiency and save energy. ProductSiteLaunchDate : 2016-07-14T14:40:35.919Z SpecificationMet : Energy UnspscCode : 31171500