The JCB-Vibromax W 355 K combination roller weighs about 8,500 pounds, and the machine's 51.2-inch front drum has a standard frequency of 3,300 vpm and amplitude of 0.020 for a centrifugal force of 10,878 pounds. An optional dual-frequency/dual-amplitude system provides forces of 6,967 or 11,911 pounds. The machine uses four pneumatic tires at the rear to knead the top-most portion of the asphalt mat. Tire spread measures 50.4 inches. The machine is powered by a four-cylinder, water-cooled Kubota diesel rated at 46.6 horsepower.