... window 2.Top-grade aluminum profile 3.top-brand hardware 4.Certificate: ISO 9001:2004 ... ;3. Good performance in air tightness, water proof and safety, effectively insulating sound and heat;4. Durable, stronger, (fireproof, antiseptic,bulletproof) function ... in any sizes as per your needs;6. Elegant, econmical and popular use;7. Different glass options are avaliable, such as ...