Square Perforated Aluminum Ceiling Sizes: 300 x 300mm, 400 x 400mm, 500 x 500mm, 600 x 600mm, 300 x 600mm, 600 x 1200mm Thickness: 0.4, 0.5, 0.6, 0.7, 0.8 and 1.0mm Surface Appearance: Artistic Perforated Surface Color: as clients' request Surface Treatment: Polyester Pre-painted, Polyester Powder Sprayed, PET-PVC pre-filmed Acoustic Insulation Paper: black color, at back side Packing: 20 pieces per carton