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Title: Cannot keep its surface even with diligent care.
Review: We rarely used these, but we did use the frying pan a lot. After a few weeks, it started to lose its surface and rust! The other pots that were not used often kept their surface, but we noticed that they started to rust, too (even with minimal use). We kept them lightly oiled and did not use harsh detergents, but they still managed to get ruined withing a few months. I guess if we oiled them daily, they might have lasted longer?
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