Set of 4 (2 with brake and 2 without brake) casters, self-lubrication steel bearings, nickel Finish and black soft rubber wheel. These quiet all-purpose casters roll easy and are resistance to chemical, water and floor debris. Wheel Diameter: 2-1/2" x 13/16", Wheel Material: Soft Rubber, Swivel Radius: 2-3/16".