The Butterfly Door Knocker was designed by Michael Healy, an accomplished Rhode Island artisan known for his Unique Door Knockers. Michael has always enjoyed watching the colorful beauty of butterflies in flight, often noticing that it is extremely difficult to find one standing still. The Butterfly Door Knocker was designed to capture this beautiful creature at rest on your front door. The Butterfly 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.