Aluminum Frame, right angle shape, beautiful appearance.firm structure design,, the thickness is between 2.8-4.5cm .Easily open, convenient for changing and installing picture and .T5 or LED light source is used for long life. Energy saver, 75% compared with traditional light box.Application: airport, railway station, subway, chain-stores, interior and outer decoration, commercial center, supermarket, bank, bus station, large exhibition, etc