Upgraded accessories: the material is environmentally friendly PU material, and the bearing is made of carbon steel.SUPERIOR MATERIAL: Made of environmentally friendly PU and carbon steel,with wear-resisting and sound off wheel, giving you a quiet and convenient life.SIZE: The size of the luggage wheels replacement is replacement wheel OD: 50mm; wheel wide: 22mm; Center Bearing Internal Diameter Is 6mm/0.23inch please check the size carefully before placing the order.EASY INSTALLATION: You just need to remove the wheel with a hacksaw at the space, and then put on the new ones with the included accessories.APPLICATION: The luggage wheels replacement kit is suitable for luggage case wheels, swivel caster, roller skate wheels, etc.Colour:blackMaterial:PU+carbon steelPackage Contents:2 x luggage suitcase replacement wheels2 x axles and screws2 x screw wrenches4 x carbon steel bearing4 x 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.