madelyn carter arts and crafts floor registers (cast aluminium) 4" x 10" (overall size: 5-1/2" x 11-1/2") madelyn carter part of our new madelyn carter line of products; hand selected by vent <br />covers unlimited for superior quality, design, and value. made from cast <br />aluminium: gives the strength and durability of steel but much lighter and <br />without the potential for rust. these registers come with a heavy duty <br />aluminum damper to control the air flow. powder coated, flat black for the <br />look and feel of cast iron always measure the size of the duct opening