of Row:Single Row product name:Bearings nsk 608z 608zz deep groove ball bearing for skateboard Material:gcr15,chrome steel,carbon steel cage:steel cage,nylon cage Service:OEM Customized Services Package:Tube,single box Lubrication:Oil Vibration:V1 V2 V3 V4 Thickness:7mm weight:0.012kg Main Market:America.Southeast Asia