Features: The white and black color of ceiling diffuser round, easy to match with any space, well integrated with the style of most space, increasing the beauty and aesthetic. The round ceiling diffuser and steel butterfly damper are lightweight and portable, convenient to carry and store, saving a lot of space, also making it smoother and easier to install. Specifications: Material: steel Color: black, white Size: Vent duct cover: about 15-15/ 16 inch in outer diameter, suitable for 12 inch duct opening Package includes: 1 x Ceiling diffusers 1 x Steel butterfly dampers Notes: Manual measurement, please allow slight errors on size. The color may exist a slight difference due to different screen displays