[Upgraded accessories] The material is environmentally friendly PU material no objectional odor, Bearings MATERIAL: Made of carbon steel,with wear-resisting and sound off wheel, giving you a quiet and convenient life. Diameter of this luggage wheel is 45mm , Rim Width is 18mm, Center Bearing internal diameter is 6.1mm. 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 Material:Eco-friendly PU+carbon steel Size:45 x 18mm inner diameter 6.1mm 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.