[Upgraded accessories] The material is environmentally friendly PU material, and the axles are longer and shorter to match sizes. [Wheels Size] Diameter Is 50mm/1.97inch, Wheel Width Is 13mm/0.51inch, Center Bearing Internal Diameter Is 6mm/0.24inch. [Rotating Flexible] The Luggage Suitcase Wheels Simple Set-up and Easy Maneuvering, Not Easy To Be Wear and Tear, Rotating Flexible, Quietness, Load-bearing, Heavy Duty Casters Wheels Rotate 360 Degrees, Replacements for Luggage Case Wheels. [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. Color: Black & Silver Material: PU Package Contents: 8 x Luggage Wheels Replacement 8 x axles and screws 4 x wrench 32 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.