01. Wooden parts are made of first class pine;
02. Coated with environment-friendly lacquer;
03. 1 kind of center pivot roof window;
04. Frame packed separately;
05. More large and free ventilation exchange outside and inside;
06. Patent and anti-noise handle lock system design;
07. Exquisite aluminum-alloy handle and top cover member;
08. Self-lock system against burglar;
09. Both-side painted 0.6 to 0.8mm thickness aluminum sheet with polyester-coated; corrugated lead skirt, which does not need any maintenance;
10. Universal flashing can suitable for any kinds roof no matter wave or flat;
11. Lead-free material to instead of lead.