Back plate is cast iron, front is of a different metal. Magnet does not stick to front. About 4 3/4 in. Diameter plus mounting tabs and set lever. The item “Antique Advertising Round Oak Doe Wah Jack Indian Cast Iron & Metal Damper” is in sale since Thursday, January 12, 2017. This item is in the category “Antiques\Home & Hearth\Stoves”. The seller is “hubnret” and is located in Waupun, Wisconsin. This item can be shipped to United States.