608zz Bearings: Single-row bearing for supporting and axial loads.Shields on both sides keeping lubricant in and contaminants out.Zurability and resistance to deformity under heavy loads. 34,000 RPM limit with grease lubrication.It's suitable for in skateboards, inline skates, scooters, and other skating applications.Bearings are Oil lubricated to be smooth.Item: 608-ZZ Ball BearingType: Deep groove ball bearingLubrication: OilClosures: 2 Shield, can't be removed and re-installed againColor:silverMaterial:carbon steelSize:8mm x 22mm x 7mmPackage Contents:25 * pcs 608zz Only the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +- 1-3cm.