Copper sheet. This offering is for sheet copper which is sixteen mils in thickness, commonly known as twelve ounce copper, due to its being twelve ounces in weight per square foot, or 27 gauge, and is about nine and one half inches in width. We are able to provide lengths up to about twenty three feet as a single piece (but only two of these are available), and are listing this per linear foot (please note the width (9.5 inches), not 1 foot, equaling about .79 square feet per linear foot). Now here is where I plagiarize my other writing which was for the rectangular copper derived from the same source (you know, sort of like cliff notes with minor changes and major embellishments). Provenance, if interested. I reclaimed this from a decommissioned industrial transformer (it weighs, or did prior to its delicate processing, about 1200 lbs.), along with some rectangular copper which we will also list, and copper foil which we are not listing (I need to cut some numbers and letters from this). I was curious (all you gals with fellas know what I'm talking about-TAKE IT APART!, let's see what's inside) as to some of the particulars of it's construction (e.g. dielectrics, tap locations, bobbin type, ad infinitum). upon dissection (literally, I cut it in half), I noticed the "patina" displayed, and found it attractive, the misses found it intriguing also and suggested that we post it to Etsy. Having been so well received in many of our other offerings I agreed, as we also have been queried in the past as to whether we might have some copper shapes available. The apparent pattern is from a combination of actual patina (oxidation primarily, e.g. copper (1) and (2) oxides which are variously green, black, and red in color, along with the customary/standard (for electrical copper 'speaker wire') varnish, and occasional tape marks. Although I have not as of yet tried, but I will be happy to attempt a non-destructive (fairly so) removal of this down to plain shiny copper by pickling in dilute nitric and thoroughly rinsing, which I have good reason to believe will yield excellent results. Also I will pass this through a set of rollers to flatten it. As always, thank you for your interest. P.S. I will be adding to and improving the photos for this post also.