The Doctor Door Knocker is sand-cast in solid bronze and treated with a patina process to give it a warm antique finish. 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.This Doctor Door Knocker has an Oiled Bronze finish and is modeled after the traditional symbol used in England to distinguish the residences of doctors. In times past, if someone were in need of medical attention, the Doctor Door Knocker would help to identify the home of a physician.