We use 1/8” thick cold rolled steel.  We just like thicker, heavier, cleaner, high quality materials.  We believe in creating a high quality product and know that that starts at the very beginning with what we use.  In the past when we tried thinner steels like 16 gauge or thinner we didn’t like how easily they bent or how sharp edges were.  So we searched for better grade steel which led us to discover that cold rolled vs hot rolled was even better at producing colors when using heat and patina finishes and was also just a better quality and heavier steel.  We recess the mounting holes for a smooth easy installation.  After being cut out the metal art is refinished and polished to prepare for paint or clear coat.  All painting is done one by one with care and thought to how it looks.  We don’t mass produce and throw stuff on it.  Each piece is individual and can have minor imperfections or variables between other pieces.  No two are alike. 
2 week turnaround for most items.  Let us know if you need it faster.