... , 600x600, 300x1200, 600x1200mm or customized size. 2012 c-shape d-shape aluminum ceiling1) material: 1100 aluminum alloy or galvanized steel2 ... 2.3mm, 3.0mm, 5.0mm), non-perforated.4) edge type: clip-in, lay-in.5) Size: 300x300, 400x400, 500x500, ... CE8) Packing: standard carton box9) Accessories: spring tee, various type of ceiling grid available.10) Features: easy installation, soundproof, fireproof ...