... ,aluminum truss 3,different size 4,have a long history screw truss,hose truss.aluminum truss,roof truss Material size details ... *150mm,200 * 200mm,300*300mm, 400*400mm ,300*400mm etc.screw to connect the standard aluminum alloyFrame :4,3,2Type: 4 ... ,Style:straight frame, round frame, arc frame Color: Optional.Connection: screw or boltCanopy:sun canopy ,rain canopy. no canopyCertification:CE, TUV ...