... length: 1 2 3 4m customizedColor: Silver customizedUsage: line array loudspeaker, lighting of outdoor concert, ectCharateristics: light weight ... truss, accessories of spigot truss, triangle bolt truss, tower system, hoist, background truss, gantryturss/led truss, layer truss, ... stage, iron stage, folding stage, wind up stan, speaker truss, scaffold, activity sands, others aluminum alloy products, ...