Photosensitive Magnesium plate For Hot foiling block, letterpress plate, which are available in various gauge sizes. Our magnesium plate would process by advanced UV light, devoloping, and chemical etching process, then die makers would get qualtiy magnesium foiling block. Magnesium blocks are recommended for medium long run operations. Compared with brass and copper dies, die makers shall get great values for money over brass and copper dies.