This bulk copper foil roll is 5 Mil (.005 inches) thick and three inches wide by four hundred and thirty feet long. It is manufactured to ASTM-B152 specifications, is annealed (soft and very malleable) with a smooth commercial finish, and is 99.9% pure copper alloy 110. This roll can be used for various electrical applications including rf shielding, craft and art projects (embossing, repousse, scrap booking, paper crafts, punching, veneering etc...), do it yourself projects, manufacturing, and much more.