The insert is metal but I don't know about copper. Would you guys believe that we just bought that bed last summer from Ashley furniture? It really isn't old. Thank you for all the compliments that I have been receiving for my two quilts I just have to quilt them. That is my goal. Two summers ago, I sewed 2 quilts for my boys (23 and 21) and quilted them and another one. I just love to sew.