This 18 gauge copper sheet is 40 Mil (.040 inches) thick and thirty-six inches wide by forty-eight inches long. It is manufactured to ASTM-B152 specifications, is annealed (dead soft and very malleable) with a smooth commercial finish, and is 99.9% pure copper alloy 110. This sheet can be used for various craft and art projects, do it yourself and construction projects, electrical applications, manufacturing, and much more! This item ships in a wooden crate for superior protection during transit to ensure your sheet arrives without damage. If you have any questions, please don't hesitate to contact us via phone at 252-491-2812, via email at firstname.lastname@example.org or through our "live chat" and we will be happy to discuss your project!