1) Film coated 2) Waterproof, rotproof, rustproof, heatproof 3) Easy to install and clean 4) Easily assembly, surface even, without gap when concatenated. 5) High intensity, corrode-resisting, aging-resisting, can be used more than 30 years. 6) Widely used for indoor or building decoration 7) Prevent fire, antibiotic, healthy and environmental.