[Upgraded accessories] The material is environmentally friendly PU material no objectional odor, and the axles are longer and shorter to match various sizes. Diameter of this luggage wheel is 55mm , Rim Width is 12mm, Center Bearing internal diameter is 8mm . A set of 2 Luggage Suitcase Replacement Wheels, integrally molded, more durable and silence. [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. PLEASE Confirm the size of this luggage wheel on our before purchasing!! Colour:black-silver Material:Environmentally friendly PU Package Contents: 2 x Wheels 2 x Axles 2 x Axles screws 4 x Washers 2 x Wrenches 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.