The Green Tree Frog is cast in solid brass with a blue green patina- Brass and bronze are copperbased alloys- The yellow brass alloy used in many of Michaels 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-Your Frog Door Knocker was designed by Michael Healy, an accomplished Rhode Island artisan- Michael has many childhood memories of summer afternoons spent trying to catch frogs in his backyard- How happy he would have been to have caught a frog as large as your Frog Door Knocker- This playful Frog Door Knocker is a reminder of the innocence of youth and will surely bring smiles to your guests faces- It has been signed by Michael Healy to confirm its authenticity-Specifications- Material Brass BlueGreen Patina- Mounting screw center to center distance 1 38- Dimensions 5-5 H x 2 W x 6-5 L SKU: MCHD030