Features:100% brand new and high qualityV groove Sealed Ball BearingsThis item is ordinary precision， adaptation to low speed， low load applicationsSpecifications:Type: 624VVSize: (ID)4mm x (OD)13mm x (thickness)6mmV groove: 4mm(width)， 1.5mm(depth)Material: high carbon steelPackage Included:10pcs V groove Sealed Ball Bearings