Upgraded accessories: The material is environmentally friendly PU materialWide Applications:perfect replacements for worn-out luggage suitcase wheels or as a back-up set just in case.Size:Center Internal Diameter Is 6mm or 0.23inch. Size 50mmX12mm360 and Quiet:They have a 360-degree rotating design that makes turn a lot smoother and easier to manage.And they can roll smoothly and quietly on virtually any surface,so you 't be bothered by the constant noise.Durable Material: wheels are made of Environmental protection PU .They have the hard-wearing design.And resistant to dirt and corrosion for a long-lasting effect.Easy To Install:The New Wheels Were Easy To Install and Works Great: 1. Use A Hacksaw To Cut Off The Pole Which Connects The Wheels. 2. Put On The New Ones With The Included Accessories.Colour:blackMaterial:PUPackage Contents:2X Luggage Wheels Replacement2X axles and screws2X wrench4X GasketOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is 1-3cm.