1,different truss 2,aluminum truss 3,different size 4,have a long history light truss.store truss,exhibition trussMaterial size details: 150* ... 150mm,200 * 200mm,300*300mm, 400*400mm ,300*400mm etc.screw to connect the standard aluminum ... alloyFrame :4,3,2Type: 4,3,2.Material: Aluminum 606,160,636,082Head ...