12oz Copper Sheet (0.016″ thickness – 26 gauge – 16 Mil) is available in any size up to 36″x120″. Shearing tolerances are plus/minus 1/8″ (0.125″). Weighs 0.75 pounds per square foot. Our copper is C110 copper and is 99.90% pure copper. Quarter Hard Temper. Unpolished Mill Finish. Sizes up to 36″x36″ are shipped flat. Larger sizes are shipped rolled and will return to flat when unpacked.