I make this from 16 gauge steel and cut this with a hand-held Plasma Cutter, then polish it and heat with an Oxygen-Acetylene torch to create the beautiful blue/brown finish. The final step is clear Powder Coating which preserves the finish and prevents tarnishing and rusting and allows you to hang it anywhere - outside or inside! Standard sizes are 7" x 8", 12" x 14" or 16" x 18". AVAILABLE IN CUSTOM SIZES.