Specification AgeRangeDescription : adult Brand : uxcell BulletPoint1 : WHAT YOU CAN GET: You will get a pair of carbon fiber finger-coated gloves which protect your hands from dirt and residue, and 10 Pcs deep-groove ball bearing.Inner Diameter (d):4mm /0.2inch; Outer Diameter (D):8mm /0.3inch; Thickness (T):3mm / 1.2inch; P0 Accuracy Class. BulletPoint2 : SKATEBOARD BEARINGS: Deep Groove Ball Bearings are used to accommodate radial and axial loads in both directions, which are simple structures, have low manufacturing costs, and are easy to achieve high manufacturing precision. It is a part of the skateboard roller. The skateboard bearings are a good hub assembly choice if you want to DIY a great skate. BulletPoint3 : HIGH-CARBON CHROMIUM STEEL BEARING: The bearings are constructed from high-carbon chromium bearing steel for durability and resistance to rust, corrosion, and deformation under heavy loads. which means the bearings do not require frequent maintenance. BulletPoint4 : DOUBLE METAL SEALED: Two metal shields on either side protect the deep groove ball bearings from dust and corrosion, which would extend usage time and reduce maintenance frequency. BulletPoint5 : WIDE APPLICATION: Deep groove ball bearings are used in many machines, including skateboards, motors, and hard drives. They reduce friction, make rotation smoother, and use less energy, which is suitable for high-speed and extremely high-speed work situations. BulletPoint6 : Weight : 339g;Package : 1 x Rod End Bearing Color : One Color ExternallyAssignedProductIdentifier : 8047294595630 IncludedComponents : Inner and outer bearing ring retainer steel ball ItemName : uxcell MR84ZZ Deep-Groove Ball Bearings for Rollers, 4mm x 8mm x 3mm Seal Bearings with Fiber Gloves, Double Metal Sealed Bearing Steel Skateboard Bearings 10Pcs ItemPackageDimensions_Height : 0.59 inches ItemPackageDimensions_Length : 5.91 inches ItemPackageDimensions_Width : 5.91 inches ItemPackageQuantity : 1 ItemTypeKeyword : deep-groove-ball-bearings Manufacturer : uxcell Material : High-carbon Chromium Bearing Steel ModelName : HJCMOONB ModelNumber : 6306 NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : a24060700ux0963 ProductDescription : Description: WHAT YOU CAN GET: Inner Diameter 4mm /0.2inch ; Outer Diameter 8mm /0.3inch ; Thickness (T): 3mm / 1.2inch ; P0 Accuracy Class; You will get a pair of carbon fiber finger-coated gloves which protect your hands from dirt and residue, and 10 Pcs deep-groove ball bearing. SKATEBOARD BEARINGS: Deep Groove Ball Bearings are used to accommodate radial and axial loads in both directions, which are simple structures, have low manufacturing costs, and are easy to achieve high manufacturing precision. It is a part of the skateboard roller. The skateboard bearings are a good hub assembly choice if you want to DIY or maintain your skate. HIGH-CARBON CHROMIUM STEEL BEARING: The bearings are constructed from high-carbon chromium bearing steel for durability and resistance to rust, corrosion, and deformation under heavy loads. which means the bearings do not require frequent maintenance. DOUBLE METAL SEALED: Two metal shields on either side protect the deep groove ball bearings from dust and corrosion, which would extend usage time and reduce maintenance frequency. WIDE APPLICATION: Deep groove ball bearings are used in many machines, including gearboxes, motors, and vehicles. They reduce friction, make rotation smoother, and use less energy, which is suitable for high-speed and extremely high-speed work situations.