Fenglv aluminum material how ah? What aluminum materials do you use for windows and doors?
Domestic aluminum quality is about the same, mainly you installed in the window accessories, is the key to the life of the service, recommend several brands Bar Reid Jan Ron Lixin spring is not recommended, quality is not very rely on live
Economic point of view, choose plastic film packaging materials. Yes, the price of the material must be more expensive, at one price per share.