01. Double hung, double glasses, with screen
02. Good damp-resistant and durability
03. Good noise isolation
04. Heat insulation
05. Easy maintenance
06. Crash-resistant
07. Good thermal preservation
08. Aging-resistant
09. Corrosion-resistant
10. Firm enough to prevent from ripoff
11. Excellent insulation
12. Long service life formula
13. Scientific design
14. Not easy to burn, smooth and elegant