This pack of 4 plate casters is made of high-quality thermoplastic rubber material that runs quietly and smoothly on various surfaces. The casters have a load capacity of up to 1000 pounds and a 3 inch diameter. Two of the casters are swivel with brakes, while the other two are rigid. The furniture caster can easily convert in any direction, and installation is straightforward with included accessories. The casters are versatile and can be used in trolleys, toolboxes, cabinets, furniture, workbenches, and more. Quality assurance is provided, and any issues or concerns will be promptly addressed.