... steel, the bond is made of sound waterborne macromolecule resin, and the surface is coated with natural granules.Galvalume ... coated with 7-layer protective ingredients of AL-Zin, macromolecule resin, natural granules, etc., therefore the tile is of ... toxic harmless materials such as metal panels, natural granules, waterborne acrylic resin.Matt design, reducing light pollution, yet rich colors, full ...