The skeletal frame of each door is made of stainless steel 1" square tubing. Then they are skinned with a layer of 1/16th stainless sheet. Then they are skinned over that with a layer of 27 ounce copper sheet. There is a silicon bronze central medallion(water jet cut) with the Greek Key decorative motif.I have applied the first treatments of a cold acid patina (thus the swirls) but it will homogenize over time especially when it rains.