... . 17 yrs Metal suspended ceiling:1) material: 1100 aluminum alloy or galvanized steel2) surface finish: outdoor polyester powder coating, film ... .3mm, 3.0mm, 5.0mm), non-perforated.4) edge type: clip-in, lay-in.5) Size: 300x300, 400x400, ... tee, various type of ceiling grid available.10) Features: easy installation, soundproof, fireproof, elegant decoration. waterproof metal ceiling tiles factory price