1.Aluminum Speaker Truss, 6m and 8m high, 400mm*400mm square truss. 2.Load capacity is 650KG. 3.Aluminum Alloy 6061-T6,6082-T6 1. Pillar: 400*400*3000mm, 400*400*2000mm.2. Main tube is 50*3mm, vice tube is 50*2mm, brace tube is 25*2mm. 3.after sales service: offer the safety instruction and free replacement for one year.4.easy to setup and dismantle .5.TUV certificate approved