Number of Row:Single Row Material:AISI52100 Chorme Steel&AISI440 Stainless Steel&AISI316 Stainless Steel Retainers (Cages):Metal Crown/ Ribbon & Nylon Crown & Phenolic Crown & Full Complement Certificate:ISO9001:2008 Load Rating:Dynamic Radial & Static Radial & Aixal Load Rating Internal Clearance:Radial Play & Axial Play with C0, C2, C3, C4, C5 Maximum Speed:reduction of approximately 20 percent Packing:8pcs Skateboard Bearings in Metal Box Lubrication:Oils, Greases, Dry Type:Skateboard Bearings Application:Inline Skates & Skateboards & Longboards Show More