The Monarch Butterfly Door Knocker is sand-cast in solid bronze and treated with a patina process to give it a rich antique finish. The oiled bronze finish is attained by successively dipping raw bronze castings into a patina solution and then buffing them to a satin finish. With the repetition of this process Michael creates the rich, dark multi-tone finish of his Oiled Bronze. The Oiled Bronze Butterfly Door Knocker was designed by Michael Healy, an accomplished Rhode Island artisan. He has always enjoyed watching the beautifully colored Monarch Butterfly. The Monarch Butterfly Door Knocker was designed to capture this beautiful creature at rest on your front door.