... section:300x300mm,etc 4.wedding roof truss,lighting truss theater lights truss bolts truss detail: Truss Material: Aluminium6061-T6 or ... acoustics,speaker, lighting and so on.Features:Lighting truss hanging lights,loud speaker.Suitable for displays, exhibition, performance show, concert, ... ,background truss,speaker truss,LED truss,scaffolding,DJ flight case,aluminum bar desk,scaffolding,and so on.