StevebV the patch box is 18 gage cold rolled sheet steel. I forget the gage of the silver but it’s about 16 to 18 thousands thick. I did bend the hinges and you can bend the cold roll sheet steel without heating it. I made a YouTube video on how I make my hinges out of cold roll sheet steel. Search for making a Charlie Bean patch box by Calvary Longrifles. Thanks for all of the kind comments. Jim