This company produces the chorus machine specification for three or four layers chorus, the standard length is 2 m * 1.1 m * 0.8 1.1 meters, the barrier height is 0.6 meters, the bracket is made up of a diameter of 50 mm of aluminum alloy tube wall thickness is 3 mm, deputy tube adopts a diameter of 30 mm, wall thickness of 2 mm aluminium tube is welded