All photo, picture, and mirror frames are made of natural resin, through 13 processes. The lifetime of frames made of Natural resin and glass fire are more than 50 years, the same as buildings. COST COMPARATION: The cost of resin and glass fire products is 1.5 times of PV foam materials,3 times of oxidase materials,5 times of gypsum materials. LIFETIME COMPARATION: Resin and glass fire frames lifetime is more than 50 years, while PV foam materials is between 15 and 20 years, oxidase materials between 5 and 8 years, gypsum materials around 3 years.