It's made of high quality aluminum alloy, it's also called eight groove,the upright extrusion play a supporting role for installing booth,we use it coordinate with exhibition panel,beam extrusion and tension locks.It fits the short time fair and its advantage is quick installation and beautiful shape for booth.So it's the important material of booth for you to attend all kinds of exhibitions.The extrusion can be made of the shape"-","W","U",easy to design the large exhibition stage and also can be made according to your design.