Round and flat diffuser Material: galvanized steel Size:80,100,125,150,160,200,250 Color:white(RAL9010,RAL9016) Aluminum alloy round Air Diffuser1 ... ) Material: galvanized sheet steel, powder coated white(RAL-9010).2) Circular style air diffuser size: 80mm ... system makes it easily installed and disconnected6) Easy to match ceiling