ProSource JC-H12 Plate Caster Rubber with Brake, 4"Highlights: Color: Black Finish: Zinc Brake Type: On Off Dimensions: 8 1 2 inch W x 16 1 2 inch D x 6 1 2 inch H Mounting Type: Plate Weight Capacity: 255 lbs Wheel Diameter: 4 inch Wheel Material: Rubber Black rubber wheel with on and off break Use for heavy objects WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more