1.Made of aluminum and the slats are filled with polyurethane foam. 2.Colors can be chosen 1)This slats filled with polyurethane foam are lighter and have more advatages. Taht are energy-saving,sunshade,sound-proofing,fire-proofing.2) Our general color is white,so if you want other color, please let me know3) The general size is 42mm, if you want other size, you can cntact me4) Gegerally, the ...