I would like to build my mammoth sized donkey a show halter, and was wondering if anyone knew what is inside the rolled throatlatch of a show halter that helps it keep it's shape? I'm guessing it must be some sort of wire, but I didn't want to just throw anything in because I believe some metals react and change the leather color. Copper seemed like it might be a good choice. Does anyone have any suggestions on what I could use? Thank you.
Amy