... resistance performance, 3.wide application and convenient to use 300*300mm line array speaker truss ,DRAGON TRUSS 1)Aluminum ... durable4) many years experience5) reasonable priceSIZE:Section:square 300*300mmBrances:20*2mmMain Tube:50*3Length:0.5/1/ ... 2/3/4we have other size for your choose:300*300mm,400*400mm,260*350mm,520*520mm,500*600mm ... feel free to contact us.Thank you! 300*300mm line array speaker