As main acoustic ceiling in roof decorate. 1) Materail: Mineral Fiber, extracting from slag fiber 2) Function: Acoustic, Heat Insulation, Fire Ristant, Variety of decorate effect 3) Advantage: High performance of RH(Relative Humidity), NRC(Noise Reduction Coefficient) and LR(Light Reflectivity) 4) Sizes:595X595mm, 603 x 603mm, 600 x 600mm, 600x1200mm, 300x600mm Thickness:7mm, 8mm, 9mm, 10mm, 12mm, 15mm, 18mm 5) Surface: kinds design & surface processing (can be order) 6) Edge: square edge, tegular edge, bevel edge, concealed. 7) 10pcs/12pcs/14pcs/18pcs/ CTN (can be order)