Upgraded accessories: The material is environmentally friendly PU material,Two-wheeled suitcase with 1 axle bar. Wide Applications: perfect replacements for worn-out luggage suitcase wheels or as a back-up set just in case. Size: Center Bearing Internal Diameter is 8mm/0.23inch. Size 60x11mm 360 Smooth and Quiet: They have a 360-degree rotating design that makes every turn a lot smoother and easier to manage. And they can roll smoothly and quietly on virtually any ,so you 't be bothered by the constant noise. Material: Our wheels are made of Environmental protection PU.They have the hard-wearing design. And to dirt and 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 With The Included Accessories. Colour:Black & Silver Material:PU Size:60x11mm Package Contents: 2 x Luggage Wheels Replacement 1 x connecting rod screws 2 x wrench 4 x Gasket Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.