Dear sir/Madam, our company are the leading manufacturer of the advertising products in China . especially the light box is our mian iterm . the material is aluminium alloy , and the light resource can be T4/T5/T8. the frame is openable and changeable , so it is convenient to change the picture . hanging from the ceiling or wall-mounted are abailable . it can work no less than 15000 hours . we have four international size: A1 A2 A3 A4 , meanwhile , we also cater to your customize.