Bore Size:1.5 mm Outster:4 mm Precision Rating:ABEC-5 Seals Type:open of Row:Single Row Material:chrome steel Application:Finger skateboard Size:1.5x4x2mm Color:silver Feature:high speed,long life radial clearance:C0 Lubrication:grease bearing series:metric Certificate:ce,rohs,FCC Product name:Various Color 1.5X4X2mm 681XZZ Fingerboard Bearing Wheels