Brakes: Each of the 4 wheels has a brake. 4 separate brakes ensure more efficient braking and a much safer transportation process. Material: The casters are made of high-density zinc and polyurethane rubber coating. The wheels move smoothly and leave no scratches on any floor. They are suitable for all indoor and outdoor floors: marble and wooden floors, concrete, asphalt roads, rubber tracks, etc. 360° Rotation: Dual ball bearing construction allows rotation in all directions. They can easily rotate in any direction during use, making your transportation process more convenient. Large Load Capacity: 100mm diameter, 130mm installation height with a 32mm tread width allow the LIFERUN blue casters set to have a load capacity of 600kg. Wide Range of Uses: The wheels can be used to transport furniture and large appliances around the house. Factories can use them to transport materials and heavy machinery. The express logistics industry can use them to transport packages.