Each piece of Beatriz Ball metalware is made by hand using the sand cast method of fabrication. Made of an aluminum alloy, this piece will neither lose its shine nor tarnish. Each piece is oven safe to 350 degrees and freezer safe. Completely food safe. Do not cut foods on the surface or use scrubbers or abrasive solutions. Hand wash and dry immediately with a soft towel. For acidic or salty foods, lightly oil the surface prior to use. Do not store foods on the surface or allow water to stand on the surface for long periods of time.