truss system/truss sleeve block material: 6061. T6 size: 60*60cm, height 10cm ISO ... 9001:2008 to build truss stage truss system/truss sleeve block material: 6061. T6, aluminum ISO 9001:20081,Complete ... in specification,light weight,flexible to use2,The sleeve block outside the truss,make the horizontal truss up and ... stage for Music show at TV tower: truss system/truss sleeve block