high quality of sound insulation, suitable appliance in port, airport, railway, high way... high noise place. Basic Material: Magnesium-Glass Board Aluminium honeycomb Aluminium Board Aluminium honeycombVeneer: Melamine, Nature Wood, Painting, Fireproof veneer, Black Skin,etc.Specification: 2440*1220*42 mmCharacteristic:Application: subway, airport, railway, high rail,etc for sound proof.