1/24 Scale. Neway air suspension Tri-drive. For use on Italeri Mack, Western star kits. Uses the same mounting points on the chassis. Also uses the kit axles, brakes, tail shaft. Resin underslung axle mounts, brake drums, cross members airbag assembly shock absorders, stabiliser bar & torque rods are supplied. Also includes chassis extension, extra axle, jack shaft and suspension parts