Specification Brand : ABI BulletPoint1 : If the bearing you are replacing is not marked with a manufacturer number, measure it and compare to specifications listed BulletPoint2 : 90% filled with Mobilux NGLI 2 synthetic grease, dual-lip labyrinth seals BulletPoint3 : RELIABLE MATERIAL - Made of great carbon steel material, it can withstand high temperatures. It has high precision, high load, and smooth rotation. Stable and durable. BulletPoint4 : SPECIAL DESIGNED - The bearing is functional and practical with dual sides iron dust cover. Avoid dust and debris relatively. Protect the lubricant, and reduce bearing noise in a high-load circumstance. BulletPoint5 : KINDLY NOTE - Please keep bearings and surroundings clean and tidy while using. Color : Black & orange ExternallyAssignedProductIdentifier : 4861006315422 ExternallyAssignedProductIdentifier1 : 0833271043083 ExternallyAssignedProductIdentifier2 : 833271043083 IncludedComponents : Ceramic Skateboard Bearings, Wax and Tool ItemName : ABI Enduro 21531 LLB Sealed Cartridge Bearing ItemPackageDimensions_Height : 0.59 inches ItemPackageDimensions_Length : 5.51 inches ItemPackageDimensions_Width : 3.94 inches ItemPackageQuantity : 1 ItemTypeKeyword : skateboard-bearings Manufacturer : ABI Material : Steel Material1 : Ceramic Material2 : Alloy Steel NumberOfItems : 1 PartNumber : MR 21531 LLB Pattern : Solid PowerSourceType : manual ProductDescription : ABI Standard Design Cartridge Bearings.90% filled with Mobilux NGLI 2 synthetic grease, dual-lip labyrinth sealsIf the bearing you are replacing is not marked with a manufacturer number, measure it and compare to specifications listedItem SpecificationsMaterialSteelBearing I.D.21.5Bearing O.D.31Manufacturer Number21531Thickness7 ProductSiteLaunchDate : 2015-08-05T13:43:49.525Z Size : 16pk - 8mm SpecificationMet : ABEC 9 SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 48.537 UnspscCode : 56101600