50 years of life , damp-resistant and durability Key Specifications/Special Features: Good damp-resistant and durability Good noise isolation Heat insulation Easy maintenance Crash-resistant Good thermal preservation Aging-resistant Corrosion-resistant Firm enough to prevent from ripoff Excellent insulation Long service life formula (over 50 years) Scientific design Not easy to burn, smooth and elegant Primary Competitive Advantages:Packaging Product Features Prompt Delivery Quality Approvals Reputation Service Competitive Price High Quality