... TUV certificate 2, good quality and fast delivery 3, have many size to choose , for many design display truss, exhibition truss, stage truss, aluminum truss, spigot truss ... for serval years.The trusses are made of aluminum alloy, and with a good welding technique, and our products ... a good managment .b) we had establish business realationships with many foreig countries that have Yemen, India, Canada, ...