... Sign, Cast Aluminum - Green LED - Aluminum Face/Black Housing - Battery Backup Specification:Material: Alluminum Alloy: 1x,2x, 3x, 4x, 5x, 6x ... , 7x seriesTemper: O, T1, T4, T5, T6, H12Shape:Rectangle Shell/ Case/ HousingSize: Flexible SizeSurface Treatment: Anodized, Power Coating, Sandblasting, Polishing, Grinding ... Sign, Cast Aluminum - Green LED - Aluminum Face/Black Housing - Battery Backup