Our most popular Southwestern piece features 4 layers. The 1st layer is heat-treated to create the beautiful blue\/brown affect. Layer 2 is the polished Zia, raised 1" from the base. The 3rd layer is copper, heat-treated for a beautiful rainbow affect, while the 4th layer is steel, heat-treated for coloring. Available in 16", 20" and 24". Custom sizes also available starting at 16" - just ask!