1 Noise Insulation: Excellent sound insulation performance to isolate indoor & outdoor noise efficiently. 2 Eco-friendly & Fireproof: Made of steel structure with fire-resistant, non-toxic environmental filling materials. 3 Wide Application: Perfect for factory workshops, hotel guest rooms, studios, equipment rooms and commercial buildings. 4 One-year Warranty: Reliable after-sales warranty to safeguard your product usage. 5 Professional Installation: Custom size available plus on-site installation for tight, airtight mounting effect.