These heavy-duty plate casters are designed for industrial applications, with a load capacity of 700 pounds each and a total capacity of 2800 pounds for the set of four. The wheels are made of polyurethane mold on steel, with a 2-inch wheel width and a 4-inch wheel diameter. The pack includes 2 swivel casters with brakes and 2 rigid casters, with a 360-degree rotation for the swivel casters. The casters have a top plate size of 4"x4-1/2" and a mounting over height of 5-5/8". These casters come in a vibrant green color and include a 90-day return policy and 100% satisfaction guarantee.