... precisionpressure-shaped gravel ensure the roof to be the best roofing material.coated with an alloy composed of Al 55%,Zn 43 ... %,Si 1.6%,with non-toxic acrylic adhesive and natural stone,color stone coated metal roof provides the advantages of long life,strength,durability ... and durability.2. light,versatility and economy--weight of color stone coated metal roof is only 1/6 weight of an ordinary cement ...