These copper sheets are 30 gauge/10 mil (.010 inches) thick and twelve inches wide by twelve inches long-this pack includes three sheets. They are manufactured to ASTM-B152 specifications, are annealed (dead soft and very malleable) with a smooth commercial finish, and are 99.9% pure copper Alloy 110 (Certificate of Conformance available upon request). These sheets can be used for various outdoor /garden projects-e.g., capping fence posts, pier pilings and exposed beams to protect the wood from weather. They can also be used for various craft and art projects, do it yourself and construction projects, electrical applications, manufacturing, and much more! Basic Copper's superior packaging provides maximum protection during shipment. If you are unsure of which thickness is right for your project, check out our Thickness Guide. 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!