Made of durable 18 gauge galvanized steel pressed to shape. Perfect for DIY wooden Viking shields and friendly combat! Proudly made by a homeschooling adoptive family in the USA. Bosses are 7 inches in diameter with a 3/4 lip and 1.9 inches deep. They are unpolished and will have scuffs and scratches. Bosses may contain an oily residue. Edges may be sharp. Handle with care. See torture test videos below!