All Beatriz Ball products are beautifully crafted by hand. Artisans in Mexico construct each brilliantly-shining piece from FDA approved, 93% aluminum alloy. The high aluminum content of the alloy provides a beautiful and lustrous shine. This shine is achieved after a four-step polishing process. Beatriz Ball metalware will never tarnish and upkeep is easy. Oven safe to 350 degrees. Please hand wash only.