The Polished Brass & Highlighted Bronze Palm Tree Door Knocker is cast in solid brass. Brass and bronze are copper-based alloys. The yellow brass alloy used in many of Michael's designs contains 70% copper and produces a warm, traditional brass look. Red bronze contains almost 85% copper. This additional copper content gives the bronze alloy its rich, reddish undertone. The mirrored finish of polished brass and polished bronze is achieved through varying degrees of sanding and buffing. Michael uses these techniques to highlight or accent the raised areas on a piece.The knocker was designed by Michael Healy, an accomplished Rhode Island artisan known for his unique Door Knockers. The Palm Tree has long been a symbol for peace and relaxation making it an ideal image to display on your front door.